[
  {
    "sku": "29412",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29412",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 315,
    "static_load_kN": 805,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 68.5,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 2600,
    "weight_g": 2780,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "At 60 x 130 x 42 mm, NTN 29412 sits in the heavy-section 29400 spherical-thrust family of the spherical-thrust programme. Two fields make up the code — 294 is the dimension series (heavy-section 29400 spherical-thrust family) and 12 encodes the 60 mm bore (bore code x 5). A machined cage guided on the shaft-washer sleeve keeps the roller set spaced at the 2,600 r/min oil rating. Minimum axial load matters here too: at speed the rollers skid on a lightly loaded bearing, so check the catalogue minimum-load formula before downsizing the thrust spring. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat. ",
    "applications": [
      "bulk-handler stacker/reclaimer slew pivots",
      "vertical hydro-turbine and large pump thrust supports",
      "rolling-mill screwdown and backup-roll thrust positions",
      "large crane and excavator slew thrust rings"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation"
    ],
    "pitfalls": [
      "Bearings of 60 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 294 heavy section tops the plan at this bore with the largest 130 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "The C0a of 805 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "Shock thrust above C0a 805 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "Oil is not optional at this rating: the 2,600 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "The Ca 315/C0a 805 kN ratings and 68.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29412; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29412?",
        "a": "29412 is a spherical roller thrust bearing to ISO 104: 60 mm shaft-washer bore, 130 mm outside diameter, 42 mm stack height (2.362 x 5.118 x 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 315 kN, C0a 805 kN and a 68.5 kN fatigue load limit Pu; limiting speed 2,600 r/min with oil lubrication; mass about 2780 g."
      },
      {
        "q": "How is the 29412 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 12 encodes the 60 mm bore (bore code x 5). The 130 mm OD and 42 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29412 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 2,600 r/min, for 29412?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29412?",
        "a": "The 60/130/42 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 315 kN / C0a 805 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29412-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29412"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29413",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29413",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 370,
    "static_load_kN": 945,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 75.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2400,
    "weight_g": 3440,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29413 is the 65 mm member of NTN's heavy-section 29400 spherical-thrust family: 140 mm over the housing washer, 45 mm tall. Decoding 29413: 294 is the dimension series (heavy-section 29400 spherical-thrust family), with 13 encodes the 65 mm bore (bore code x 5). Catalogue mass is about 3.4 kg for the full washer-and-roller stack. The 65/140/45 envelope follows ISO 104, so dimensional interchange holds between makers; osculation, roller profile and ratings do not automatically follow. Fill the housing with the specified oil to the level that reaches the cage — these bearings are oil-bath or circulation machines, not grease machines. ",
    "applications": [
      "rolling-mill screwdown and backup-roll thrust positions",
      "large crane and excavator slew thrust rings",
      "pellet-mill and grinder main-shaft thrust seats",
      "ship propulsion and rudder thrust blocks"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces"
    ],
    "pitfalls": [
      "Bearings of 65 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 294 heavy section tops the plan at this bore with the largest 140 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29413 stack as a set.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "The 45 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 370/C0a 945 kN ratings and 75.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29413; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29413?",
        "a": "29413 is a spherical roller thrust bearing to ISO 104: 65 mm shaft-washer bore, 140 mm outside diameter, 45 mm stack height (2.559 x 5.512 x 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 370 kN, C0a 945 kN and a 75.5 kN fatigue load limit Pu; limiting speed 2,400 r/min with oil lubrication; mass about 3440 g."
      },
      {
        "q": "How is the 29413 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 13 encodes the 65 mm bore (bore code x 5). The 140 mm OD and 45 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29413 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 2,400 r/min, for 29413?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29413?",
        "a": "The 65/140/45 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 370 kN / C0a 945 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29413-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29413"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29414",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29414",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 405,
    "static_load_kN": 1040,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 87.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2200,
    "weight_g": 4190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "From the heavy-section 29400 spherical-thrust family, 29414 measures 70 mm through the shaft washer, 150 mm over the outside and 48 mm in assembled height. NTN builds the number from 294 is the dimension series (heavy-section 29400 spherical-thrust family); 14 encodes the 70 mm bore (bore code x 5). With Ca 405 kN and C0a 1040 kN, each mm of bore carries about 5.79 kN of dynamic axial rating. Within the spherical-thrust plan, 292 is the light section and 294 the heavy one; stepping up from a 292 to a 294 at the same bore roughly doubles the C0a class. After filling with oil, rotate slowly and watch torque and temperature; a misrouted oil feed shows up in the first minutes of running. ",
    "applications": [
      "pellet-mill and grinder main-shaft thrust seats",
      "ship propulsion and rudder thrust blocks",
      "large mixer, reactor and agitator vertical shafts",
      "bulk-handler stacker/reclaimer slew pivots"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact"
    ],
    "pitfalls": [
      "Bearings of 70 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 294 heavy section tops the plan at this bore with the largest 150 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "The 48 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29414 was chosen for.",
      "The C0a of 1040 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "The Ca 405/C0a 1040 kN ratings and 87.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29414; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29414?",
        "a": "29414 is a spherical roller thrust bearing to ISO 104: 70 mm shaft-washer bore, 150 mm outside diameter, 48 mm stack height (2.756 x 5.906 x 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 405 kN, C0a 1040 kN and a 87.5 kN fatigue load limit Pu; limiting speed 2,200 r/min with oil lubrication; mass about 4190 g."
      },
      {
        "q": "How is the 29414 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 14 encodes the 70 mm bore (bore code x 5). The 150 mm OD and 48 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29414 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 2,200 r/min, for 29414?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29414?",
        "a": "The 70/150/48 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 405 kN / C0a 1040 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29414-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29414"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29415",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29415",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 465,
    "static_load_kN": 1190,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 102,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2100,
    "weight_g": 5070,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29415 is an NTN spherical roller thrust bearing of the heavy-section 29400 spherical-thrust family: 75 mm bore, 160 mm outside diameter, 51 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 15 encodes the 75 mm bore (bore code x 5). Shaft and housing washers separate, so the 75 mm shaft washer can be mounted on the shaft before the roller set and housing washer follow. Against a thrust ball bearing of the same 75 mm bore, this bearing carries many times the load at lower speed — the trade is oil lubrication and price. On vertical shafts, confirm the minimum axial load from the rotor weight plus any spring preload before the first run at speed. ",
    "applications": [
      "large mixer, reactor and agitator vertical shafts",
      "bulk-handler stacker/reclaimer slew pivots",
      "vertical hydro-turbine and large pump thrust supports",
      "rolling-mill screwdown and backup-roll thrust positions"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "Bearings of 75 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 294 heavy section tops the plan at this bore with the largest 160 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "Oil is not optional at this rating: the 2,100 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29415 was chosen for.",
      "The Ca 465/C0a 1190 kN ratings and 102 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29415; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29415?",
        "a": "29415 is a spherical roller thrust bearing to ISO 104: 75 mm shaft-washer bore, 160 mm outside diameter, 51 mm stack height (2.953 x 6.299 x 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 465 kN, C0a 1190 kN and a 102 kN fatigue load limit Pu; limiting speed 2,100 r/min with oil lubrication; mass about 5070 g."
      },
      {
        "q": "How is the 29415 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 15 encodes the 75 mm bore (bore code x 5). The 160 mm OD and 51 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29415 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 2,100 r/min, for 29415?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29415?",
        "a": "The 75/160/51 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 465 kN / C0a 1190 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29415-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29415"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29416",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29416",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 54,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 510,
    "static_load_kN": 1380,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 102,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 1900,
    "weight_g": 6090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 29416 appears as a heavy-section 29400 spherical-thrust family bearing with a 80 mm shaft washer, 170 mm across the housing washer and 54 mm of height. Reading the code: 294 is the dimension series (heavy-section 29400 spherical-thrust family), and 16 encodes the 80 mm bore (bore code x 5). The single printed speed, 1,900 r/min, is an oil-lubrication figure: the catalogue greases these bearings only for the smallest duties, and this size is rated for oil. For oscillating or slow heavy duty, size from C0a 1380 kN with the static safety factor rather than from the life equation. Lift the bearing by the washers, never through the roller set; a 6.1 kg stack punishes improvisation. ",
    "applications": [
      "vertical hydro-turbine and large pump thrust supports",
      "rolling-mill screwdown and backup-roll thrust positions",
      "large crane and excavator slew thrust rings",
      "pellet-mill and grinder main-shaft thrust seats"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "Bearings of 80 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 294 heavy section tops the plan at this bore with the largest 170 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Oil is not optional at this rating: the 1,900 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 1,900 r/min end of the range.",
      "The Ca 510/C0a 1380 kN ratings and 102 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29416; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29416?",
        "a": "29416 is a spherical roller thrust bearing to ISO 104: 80 mm shaft-washer bore, 170 mm outside diameter, 54 mm stack height (3.15 x 6.693 x 2.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 510 kN, C0a 1380 kN and a 102 kN fatigue load limit Pu; limiting speed 1,900 r/min with oil lubrication; mass about 6090 g."
      },
      {
        "q": "How is the 29416 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 16 encodes the 80 mm bore (bore code x 5). The 170 mm OD and 54 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29416 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,900 r/min, for 29416?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29416?",
        "a": "The 80/170/54 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 510 kN / C0a 1380 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29416-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29416"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29317",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29317",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 295,
    "static_load_kN": 820,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 78.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2300,
    "weight_g": 2940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29317 is an NTN spherical roller thrust bearing of the medium-section 29300 spherical-thrust family: 85 mm bore, 150 mm outside diameter, 39 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Decoding 29317: 293 is the dimension series (medium-section 29300 spherical-thrust family), with 17 encodes the 85 mm bore (bore code x 5). Asymmetric rollers and the angled contact mean the bearing also tolerates radial load — the catalogue allows a radial share while axial load clearly dominates. Within the spherical-thrust plan, 292 is the light section and 294 the heavy one; stepping up from a 292 to a 294 at the same bore roughly doubles the C0a class. Fill the housing with the specified oil to the level that reaches the cage — these bearings are oil-bath or circulation machines, not grease machines. ",
    "applications": [
      "ship propulsion and rudder thrust blocks",
      "large mixer, reactor and agitator vertical shafts",
      "bulk-handler stacker/reclaimer slew pivots",
      "vertical hydro-turbine and large pump thrust supports"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces"
    ],
    "pitfalls": [
      "Bearings of 85 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 85 mm bore.",
      "The C0a of 820 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "Oil is not optional at this rating: the 2,300 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "Shock thrust above C0a 820 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "The Ca 295/C0a 820 kN ratings and 78.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29317; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29317?",
        "a": "29317 is a spherical roller thrust bearing to ISO 104: 85 mm shaft-washer bore, 150 mm outside diameter, 39 mm stack height (3.346 x 5.906 x 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 295 kN, C0a 820 kN and a 78.5 kN fatigue load limit Pu; limiting speed 2,300 r/min with oil lubrication; mass about 2940 g."
      },
      {
        "q": "How is the 29317 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 17 encodes the 85 mm bore (bore code x 5). The 150 mm OD and 39 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29317 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 2,300 r/min, for 29317?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29317?",
        "a": "The 85/150/39 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 295 kN / C0a 820 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29317-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29317"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29417",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29417",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 545,
    "static_load_kN": 1480,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 118,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 1800,
    "weight_g": 7200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "NTN 29417 belongs to the heavy-section 29400 spherical-thrust family of spherical roller thrust bearings: 85 / 180 / 58 mm (bore / OD / height). Two fields make up the code — 294 is the dimension series (heavy-section 29400 spherical-thrust family) and 17 encodes the 85 mm bore (bore code x 5). Catalogue axial dynamic rating Ca is 545 kN against C0a 1480 kN — the roller contact line is why a 85 mm bore here out-carries any thrust ball bearing of the same size. If speed climbs toward the 1,800 r/min oil rating, the lubrication design — bath, circulation, cooling — becomes the real selection criterion. The 85 mm shaft washer normally mounts with a tight shaft fit; support the housing washer so it stays free to align on its spherical seat. ",
    "applications": [
      "large crane and excavator slew thrust rings",
      "pellet-mill and grinder main-shaft thrust seats",
      "ship propulsion and rudder thrust blocks",
      "large mixer, reactor and agitator vertical shafts"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation"
    ],
    "pitfalls": [
      "Bearings of 85 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 294 heavy section tops the plan at this bore with the largest 180 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Below the minimum axial load the rollers skid; at 1,800 r/min the Ca of 545 kN never comes into play before the raceway is smeared.",
      "Below the minimum axial load the rollers skid; at 1,800 r/min the Ca of 545 kN never comes into play before the raceway is smeared.",
      "Below the minimum axial load the rollers skid; at 1,800 r/min the Ca of 545 kN never comes into play before the raceway is smeared.",
      "The Ca 545/C0a 1480 kN ratings and 118 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29417; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29417?",
        "a": "29417 is a spherical roller thrust bearing to ISO 104: 85 mm shaft-washer bore, 180 mm outside diameter, 58 mm stack height (3.346 x 7.087 x 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 545 kN, C0a 1480 kN and a 118 kN fatigue load limit Pu; limiting speed 1,800 r/min with oil lubrication; mass about 7200 g."
      },
      {
        "q": "How is the 29417 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 17 encodes the 85 mm bore (bore code x 5). The 180 mm OD and 58 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29417 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,800 r/min, for 29417?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29417?",
        "a": "The 85/180/58 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 545 kN / C0a 1480 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29417-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29417"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29318",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29318",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 90,
    "D_mm": 155,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 320,
    "static_load_kN": 915,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 84,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2300,
    "weight_g": 3080,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 29318 appears as a medium-section 29300 spherical-thrust family bearing with a 90 mm shaft washer, 155 mm across the housing washer and 39 mm of height. NTN builds the number from 293 is the dimension series (medium-section 29300 spherical-thrust family); 18 encodes the 90 mm bore (bore code x 5). The spherical housing raceway lets the shaft washer align itself as the seats settle — the property that keeps the 915 kN static rating honest in real housings. Against a thrust ball bearing of the same 90 mm bore, this bearing carries many times the load at lower speed — the trade is oil lubrication and price. After filling with oil, rotate slowly and watch torque and temperature; a misrouted oil feed shows up in the first minutes of running. ",
    "applications": [
      "bulk-handler stacker/reclaimer slew pivots",
      "vertical hydro-turbine and large pump thrust supports",
      "rolling-mill screwdown and backup-roll thrust positions",
      "large crane and excavator slew thrust rings"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact"
    ],
    "pitfalls": [
      "Bearings of 90 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 90 mm bore.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29318 stack as a set.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "The Ca 320/C0a 915 kN ratings and 84 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29318; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29318?",
        "a": "29318 is a spherical roller thrust bearing to ISO 104: 90 mm shaft-washer bore, 155 mm outside diameter, 39 mm stack height (3.543 x 6.102 x 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 320 kN, C0a 915 kN and a 84 kN fatigue load limit Pu; limiting speed 2,300 r/min with oil lubrication; mass about 3080 g."
      },
      {
        "q": "How is the 29318 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 18 encodes the 90 mm bore (bore code x 5). The 155 mm OD and 39 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29318 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 2,300 r/min, for 29318?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29318?",
        "a": "The 90/155/39 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 320 kN / C0a 915 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29318-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×155×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29318"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29418",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29418",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 610,
    "static_load_kN": 1680,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 121,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 1700,
    "weight_g": 8380,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy-section 29400 spherical-thrust family entry 29418 combines a spherical housing-washer raceway with asymmetric barrel rollers in 60 mm of stack height. Decoding 29418: 294 is the dimension series (heavy-section 29400 spherical-thrust family), with 18 encodes the 90 mm bore (bore code x 5). The static/dynamic ratio of 2.75 tells the story of a roller raceway: enormous reserve for slow, shocked or oscillating thrust. Where the shaft also needs radial location, pair this bearing with a spherical roller or cylindrical radial bearing — the thrust bearing is not a radial guide. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 610 kN class thrust. ",
    "applications": [
      "ship propulsion and rudder thrust blocks",
      "large mixer, reactor and agitator vertical shafts",
      "bulk-handler stacker/reclaimer slew pivots",
      "vertical hydro-turbine and large pump thrust supports"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces"
    ],
    "pitfalls": [
      "Bearings of 90 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 294 heavy section tops the plan at this bore with the largest 190 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "The C0a of 1680 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "The Ca 610/C0a 1680 kN ratings and 121 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29418; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29418?",
        "a": "29418 is a spherical roller thrust bearing to ISO 104: 90 mm shaft-washer bore, 190 mm outside diameter, 60 mm stack height (3.543 x 7.48 x 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 610 kN, C0a 1680 kN and a 121 kN fatigue load limit Pu; limiting speed 1,700 r/min with oil lubrication; mass about 8380 g."
      },
      {
        "q": "How is the 29418 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 18 encodes the 90 mm bore (bore code x 5). The 190 mm OD and 60 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29418 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,700 r/min, for 29418?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29418?",
        "a": "The 90/190/60 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 610 kN / C0a 1680 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29418-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29418"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29320",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29320",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 100,
    "D_mm": 170,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 385,
    "static_load_kN": 1160,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 96,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2100,
    "weight_g": 3940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The medium-section 29300 spherical-thrust family entry 29320 combines a spherical housing-washer raceway with asymmetric barrel rollers in 42 mm of stack height. Decoding 29320: 293 is the dimension series (medium-section 29300 spherical-thrust family), with 20 encodes the 100 mm bore (bore code x 5). The single printed speed, 2,100 r/min, is an oil-lubrication figure: the catalogue greases these bearings only for the smallest duties, and this size is rated for oil. Choose the medium-section 29300 spherical-thrust family when heavy thrust meets misalignment: vertical turbines, mills and slew pivots are the classic homes. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat. ",
    "applications": [
      "large mixer, reactor and agitator vertical shafts",
      "bulk-handler stacker/reclaimer slew pivots",
      "vertical hydro-turbine and large pump thrust supports",
      "rolling-mill screwdown and backup-roll thrust positions"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces"
    ],
    "pitfalls": [
      "Bearings of 100 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 100 mm bore.",
      "Shock thrust above C0a 1160 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "The C0a of 1160 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 2,100 r/min end of the range.",
      "The Ca 385/C0a 1160 kN ratings and 96 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29320; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29320?",
        "a": "29320 is a spherical roller thrust bearing to ISO 104: 100 mm shaft-washer bore, 170 mm outside diameter, 42 mm stack height (3.937 x 6.693 x 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 385 kN, C0a 1160 kN and a 96 kN fatigue load limit Pu; limiting speed 2,100 r/min with oil lubrication; mass about 3940 g."
      },
      {
        "q": "How is the 29320 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 20 encodes the 100 mm bore (bore code x 5). The 170 mm OD and 42 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29320 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 2,100 r/min, for 29320?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29320?",
        "a": "The 100/170/42 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 385 kN / C0a 1160 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29320-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×170×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29320"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29420",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29420",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 100,
    "D_mm": 210,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 760,
    "static_load_kN": 2130,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 156,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1500,
    "weight_g": 11500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29420 is the 100 mm member of NTN's heavy-section 29400 spherical-thrust family: 210 mm over the housing washer, 67 mm tall. Two fields make up the code — 294 is the dimension series (heavy-section 29400 spherical-thrust family) and 20 encodes the 100 mm bore (bore code x 5). A machined cage guided on the shaft-washer sleeve keeps the roller set spaced at the 1,500 r/min oil rating. Within the spherical-thrust plan, 292 is the light section and 294 the heavy one; stepping up from a 292 to a 294 at the same bore roughly doubles the C0a class. Lift the bearing by the washers, never through the roller set; a 12 kg stack punishes improvisation. ",
    "applications": [
      "pellet-mill and grinder main-shaft thrust seats",
      "ship propulsion and rudder thrust blocks",
      "large mixer, reactor and agitator vertical shafts",
      "bulk-handler stacker/reclaimer slew pivots"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation"
    ],
    "pitfalls": [
      "Bearings of 100 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 294 heavy section tops the plan at this bore with the largest 210 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "The 67 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29420 stack as a set.",
      "Oil is not optional at this rating: the 1,500 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "The Ca 760/C0a 2130 kN ratings and 156 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29420; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29420?",
        "a": "29420 is a spherical roller thrust bearing to ISO 104: 100 mm shaft-washer bore, 210 mm outside diameter, 67 mm stack height (3.937 x 8.268 x 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 760 kN, C0a 2130 kN and a 156 kN fatigue load limit Pu; limiting speed 1,500 r/min with oil lubrication; mass about 11500 g."
      },
      {
        "q": "How is the 29420 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 20 encodes the 100 mm bore (bore code x 5). The 210 mm OD and 67 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29420 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,500 r/min, for 29420?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29420?",
        "a": "The 100/210/67 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 760 kN / C0a 2130 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29420-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×210×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29420"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29322",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29322",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 110,
    "D_mm": 190,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 495,
    "static_load_kN": 1500,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 1800,
    "weight_g": 5780,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29322 is the 110 mm member of NTN's medium-section 29300 spherical-thrust family: 190 mm over the housing washer, 48 mm tall. The designation is 293 is the dimension series (medium-section 29300 spherical-thrust family) plus 22 encodes the 110 mm bore (bore code x 5). The static/dynamic ratio of 3.03 tells the story of a roller raceway: enormous reserve for slow, shocked or oscillating thrust. The 110/190/48 envelope follows ISO 104, so dimensional interchange holds between makers; osculation, roller profile and ratings do not automatically follow. After filling with oil, rotate slowly and watch torque and temperature; a misrouted oil feed shows up in the first minutes of running. ",
    "applications": [
      "large crane and excavator slew thrust rings",
      "pellet-mill and grinder main-shaft thrust seats",
      "ship propulsion and rudder thrust blocks",
      "large mixer, reactor and agitator vertical shafts"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "Bearings of 110 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 110 mm bore.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29322 stack as a set.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "The Ca 495/C0a 1500 kN ratings and 120 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29322; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29322?",
        "a": "29322 is a spherical roller thrust bearing to ISO 104: 110 mm shaft-washer bore, 190 mm outside diameter, 48 mm stack height (4.331 x 7.48 x 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 495 kN, C0a 1500 kN and a 120 kN fatigue load limit Pu; limiting speed 1,800 r/min with oil lubrication; mass about 5780 g."
      },
      {
        "q": "How is the 29322 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 22 encodes the 110 mm bore (bore code x 5). The 190 mm OD and 48 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29322 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,800 r/min, for 29322?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29322?",
        "a": "The 110/190/48 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 495 kN / C0a 1500 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29322-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×190×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29322"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29422",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29422",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 110,
    "D_mm": 230,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 940,
    "static_load_kN": 2620,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 193,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1400,
    "weight_g": 15000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29422 is an NTN spherical roller thrust bearing of the heavy-section 29400 spherical-thrust family: 110 mm bore, 230 mm outside diameter, 73 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. NTN builds the number from 294 is the dimension series (heavy-section 29400 spherical-thrust family); 22 encodes the 110 mm bore (bore code x 5). With Ca 940 kN and C0a 2620 kN, each mm of bore carries about 8.55 kN of dynamic axial rating. For oscillating or slow heavy duty, size from C0a 2620 kN with the static safety factor rather than from the life equation. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 940 kN class thrust. ",
    "applications": [
      "vertical hydro-turbine and large pump thrust supports",
      "rolling-mill screwdown and backup-roll thrust positions",
      "large crane and excavator slew thrust rings",
      "pellet-mill and grinder main-shaft thrust seats"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact"
    ],
    "pitfalls": [
      "Bearings of 110 mm bore need planned lifting and heating; a shaft washer driven on cold and crooked starts the failure clock before the first load.",
      "The 294 heavy section tops the plan at this bore with the largest 230 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Oil is not optional at this rating: the 1,400 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "The 73 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The C0a of 2620 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "The Ca 940/C0a 2620 kN ratings and 193 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29422; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29422?",
        "a": "29422 is a spherical roller thrust bearing to ISO 104: 110 mm shaft-washer bore, 230 mm outside diameter, 73 mm stack height (4.331 x 9.055 x 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 940 kN, C0a 2620 kN and a 193 kN fatigue load limit Pu; limiting speed 1,400 r/min with oil lubrication; mass about 15000 g."
      },
      {
        "q": "How is the 29422 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 22 encodes the 110 mm bore (bore code x 5). The 230 mm OD and 73 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29422 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,400 r/min, for 29422?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29422?",
        "a": "The 110/230/73 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 940 kN / C0a 2620 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29422-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×230×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29422"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29324",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29324",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 120,
    "D_mm": 210,
    "B_mm": 54,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 595,
    "static_load_kN": 1770,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 151,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1600,
    "weight_g": 7920,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29324 is an NTN spherical roller thrust bearing of the medium-section 29300 spherical-thrust family: 120 mm bore, 210 mm outside diameter, 54 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Two fields make up the code — 293 is the dimension series (medium-section 29300 spherical-thrust family) and 24 encodes the 120 mm bore (bore code x 5). At 54 mm of height the bearing packs the medium-section capacity into a stack far shorter than a comparable multi-row ball arrangement. Against a thrust ball bearing of the same 120 mm bore, this bearing carries many times the load at lower speed — the trade is oil lubrication and price. Lift the bearing by the washers, never through the roller set; a 7.9 kg stack punishes improvisation. ",
    "applications": [
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation"
    ],
    "pitfalls": [
      "At 120 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 120 mm bore.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29324 stack as a set.",
      "The 54 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The Ca 595/C0a 1770 kN ratings and 151 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29324; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29324?",
        "a": "29324 is a spherical roller thrust bearing to ISO 104: 120 mm shaft-washer bore, 210 mm outside diameter, 54 mm stack height (4.724 x 8.268 x 2.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 595 kN, C0a 1770 kN and a 151 kN fatigue load limit Pu; limiting speed 1,600 r/min with oil lubrication; mass about 7920 g."
      },
      {
        "q": "How is the 29324 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 24 encodes the 120 mm bore (bore code x 5). The 210 mm OD and 54 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29324 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,600 r/min, for 29324?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29324?",
        "a": "The 120/210/54 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 595 kN / C0a 1770 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29324-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×210×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29324"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29424",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29424",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 120,
    "D_mm": 250,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1080,
    "static_load_kN": 3050,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 212,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1300,
    "weight_g": 18600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "NTN 29424 belongs to the heavy-section 29400 spherical-thrust family of spherical roller thrust bearings: 120 / 250 / 78 mm (bore / OD / height). Reading the code: 294 is the dimension series (heavy-section 29400 spherical-thrust family), and 24 encodes the 120 mm bore (bore code x 5). The single printed speed, 1,300 r/min, is an oil-lubrication figure: the catalogue greases these bearings only for the smallest duties, and this size is rated for oil. Where the shaft also needs radial location, pair this bearing with a spherical roller or cylindrical radial bearing — the thrust bearing is not a radial guide. Fill the housing with the specified oil to the level that reaches the cage — these bearings are oil-bath or circulation machines, not grease machines. ",
    "applications": [
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 120 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 250 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 1,300 r/min end of the range.",
      "The Ca 1080/C0a 3050 kN ratings and 212 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29424; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29424?",
        "a": "29424 is a spherical roller thrust bearing to ISO 104: 120 mm shaft-washer bore, 250 mm outside diameter, 78 mm stack height (4.724 x 9.843 x 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1080 kN, C0a 3050 kN and a 212 kN fatigue load limit Pu; limiting speed 1,300 r/min with oil lubrication; mass about 18600 g."
      },
      {
        "q": "How is the 29424 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 24 encodes the 120 mm bore (bore code x 5). The 250 mm OD and 78 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29424 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,300 r/min, for 29424?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29424?",
        "a": "The 120/250/78 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1080 kN / C0a 3050 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29424-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×250×78 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29424"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29326",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29326",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 130,
    "D_mm": 225,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 685,
    "static_load_kN": 2100,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 168,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1500,
    "weight_g": 9760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "NTN 29326 belongs to the medium-section 29300 spherical-thrust family of spherical roller thrust bearings: 130 / 225 / 58 mm (bore / OD / height). NTN builds the number from 293 is the dimension series (medium-section 29300 spherical-thrust family); 26 encodes the 130 mm bore (bore code x 5). The spherical housing raceway lets the shaft washer align itself as the seats settle — the property that keeps the 2100 kN static rating honest in real housings. If speed climbs toward the 1,500 r/min oil rating, the lubrication design — bath, circulation, cooling — becomes the real selection criterion. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 685 kN class thrust. ",
    "applications": [
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact"
    ],
    "pitfalls": [
      "At 130 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 130 mm bore.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "The Ca 685/C0a 2100 kN ratings and 168 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29326; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29326?",
        "a": "29326 is a spherical roller thrust bearing to ISO 104: 130 mm shaft-washer bore, 225 mm outside diameter, 58 mm stack height (5.118 x 8.858 x 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 685 kN, C0a 2100 kN and a 168 kN fatigue load limit Pu; limiting speed 1,500 r/min with oil lubrication; mass about 9760 g."
      },
      {
        "q": "How is the 29326 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 26 encodes the 130 mm bore (bore code x 5). The 225 mm OD and 58 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29326 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,500 r/min, for 29326?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29326?",
        "a": "The 130/225/58 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 685 kN / C0a 2100 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29326-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×225×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29326"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29426",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29426",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 130,
    "D_mm": 270,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1200,
    "static_load_kN": 3550,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 232,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1200,
    "weight_g": 23700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "At 130 x 270 x 85 mm, NTN 29426 sits in the heavy-section 29400 spherical-thrust family of the spherical-thrust programme. Decoding 29426: 294 is the dimension series (heavy-section 29400 spherical-thrust family), with 26 encodes the 130 mm bore (bore code x 5). The static/dynamic ratio of 2.96 tells the story of a roller raceway: enormous reserve for slow, shocked or oscillating thrust. Choose the heavy-section 29400 spherical-thrust family when heavy thrust meets misalignment: vertical turbines, mills and slew pivots are the classic homes. On vertical shafts, confirm the minimum axial load from the rotor weight plus any spring preload before the first run at speed. ",
    "applications": [
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces"
    ],
    "pitfalls": [
      "At 130 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 270 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Shock thrust above C0a 3550 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "Oil is not optional at this rating: the 1,200 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "The Ca 1200/C0a 3550 kN ratings and 232 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29426; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29426?",
        "a": "29426 is a spherical roller thrust bearing to ISO 104: 130 mm shaft-washer bore, 270 mm outside diameter, 85 mm stack height (5.118 x 10.63 x 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1200 kN, C0a 3550 kN and a 232 kN fatigue load limit Pu; limiting speed 1,200 r/min with oil lubrication; mass about 23700 g."
      },
      {
        "q": "How is the 29426 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 26 encodes the 130 mm bore (bore code x 5). The 270 mm OD and 85 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29426 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,200 r/min, for 29426?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29426?",
        "a": "The 130/270/85 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1200 kN / C0a 3550 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29426-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×270×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29426"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29328",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29328",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 140,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 760,
    "static_load_kN": 2360,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 182,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1400,
    "weight_g": 11400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "At 140 x 240 x 60 mm, NTN 29328 sits in the medium-section 29300 spherical-thrust family of the spherical-thrust programme. Reading the code: 293 is the dimension series (medium-section 29300 spherical-thrust family), and 28 encodes the 140 mm bore (bore code x 5). Catalogue mass is about 11 kg for the full washer-and-roller stack. Selection starts from the load case: axial must dominate, and any radial share must stay within the catalogue combined-load rule while the bearing self-aligns. Fill the housing with the specified oil to the level that reaches the cage — these bearings are oil-bath or circulation machines, not grease machines. ",
    "applications": [
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 140 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 140 mm bore.",
      "Below the minimum axial load the rollers skid; at 1,400 r/min the Ca of 760 kN never comes into play before the raceway is smeared.",
      "Oil is not optional at this rating: the 1,400 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "The 60 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 760/C0a 2360 kN ratings and 182 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29328; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29328?",
        "a": "29328 is a spherical roller thrust bearing to ISO 104: 140 mm shaft-washer bore, 240 mm outside diameter, 60 mm stack height (5.512 x 9.449 x 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 760 kN, C0a 2360 kN and a 182 kN fatigue load limit Pu; limiting speed 1,400 r/min with oil lubrication; mass about 11400 g."
      },
      {
        "q": "How is the 29328 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 28 encodes the 140 mm bore (bore code x 5). The 240 mm OD and 60 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29328 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,400 r/min, for 29328?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29328?",
        "a": "The 140/240/60 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 760 kN / C0a 2360 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29328-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×240×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29328"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29428",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29428",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 140,
    "D_mm": 280,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1240,
    "static_load_kN": 3750,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1200,
    "weight_g": 25200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "From the heavy-section 29400 spherical-thrust family, 29428 measures 140 mm through the shaft washer, 280 mm over the outside and 85 mm in assembled height. The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 28 encodes the 140 mm bore (bore code x 5). At 85 mm of height the bearing packs the heavy-section capacity into a stack far shorter than a comparable multi-row ball arrangement. The 140/280/85 envelope follows ISO 104, so dimensional interchange holds between makers; osculation, roller profile and ratings do not automatically follow. The 140 mm shaft washer normally mounts with a tight shaft fit; support the housing washer so it stays free to align on its spherical seat. ",
    "applications": [
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "At 140 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 280 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "Below the minimum axial load the rollers skid; at 1,200 r/min the Ca of 1240 kN never comes into play before the raceway is smeared.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The Ca 1240/C0a 3750 kN ratings and 252 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29428; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29428?",
        "a": "29428 is a spherical roller thrust bearing to ISO 104: 140 mm shaft-washer bore, 280 mm outside diameter, 85 mm stack height (5.512 x 11.024 x 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1240 kN, C0a 3750 kN and a 252 kN fatigue load limit Pu; limiting speed 1,200 r/min with oil lubrication; mass about 25200 g."
      },
      {
        "q": "How is the 29428 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 28 encodes the 140 mm bore (bore code x 5). The 280 mm OD and 85 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29428 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,200 r/min, for 29428?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29428?",
        "a": "The 140/280/85 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1240 kN / C0a 3750 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29428-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×280×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29428"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29230",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29230",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 150,
    "D_mm": 215,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 380,
    "static_load_kN": 1340,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 122,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 1800,
    "weight_g": 4560,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "At 150 x 215 x 39 mm, NTN 29230 sits in the light-section 29200 spherical-thrust family of the spherical-thrust programme. Reading the code: 292 is the dimension series (light-section 29200 spherical-thrust family), and 30 encodes the 150 mm bore (bore code x 5). Shaft and housing washers separate, so the 150 mm shaft washer can be mounted on the shaft before the roller set and housing washer follow. If speed climbs toward the 1,800 r/min oil rating, the lubrication design — bath, circulation, cooling — becomes the real selection criterion. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 380 kN class thrust. ",
    "applications": [
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 150 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 150 mm bore it trades capacity for a smaller 215 mm OD and lower height.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 1,800 r/min end of the range.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29230 was chosen for.",
      "The Ca 380/C0a 1340 kN ratings and 122 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29230; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29230?",
        "a": "29230 is a spherical roller thrust bearing to ISO 104: 150 mm shaft-washer bore, 215 mm outside diameter, 39 mm stack height (5.906 x 8.465 x 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 380 kN, C0a 1340 kN and a 122 kN fatigue load limit Pu; limiting speed 1,800 r/min with oil lubrication; mass about 4560 g."
      },
      {
        "q": "How is the 29230 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 30 encodes the 150 mm bore (bore code x 5). The 215 mm OD and 39 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29230 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,800 r/min, for 29230?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29230?",
        "a": "The 150/215/39 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 380 kN / C0a 1340 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29230-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×215×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29230"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29330",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29330",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 750,
    "static_load_kN": 2390,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1400,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "From the medium-section 29300 spherical-thrust family, 29330 measures 150 mm through the shaft washer, 250 mm over the outside and 60 mm in assembled height. The designation is 293 is the dimension series (medium-section 29300 spherical-thrust family) plus 30 encodes the 150 mm bore (bore code x 5). The static/dynamic ratio of 3.19 tells the story of a roller raceway: enormous reserve for slow, shocked or oscillating thrust. Against a thrust ball bearing of the same 150 mm bore, this bearing carries many times the load at lower speed — the trade is oil lubrication and price. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 750 kN class thrust. ",
    "applications": [
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "At 150 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 150 mm bore.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29330 stack as a set.",
      "Below the minimum axial load the rollers skid; at 1,400 r/min the Ca of 750 kN never comes into play before the raceway is smeared.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "The Ca 750/C0a 2390 kN ratings and 191 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29330; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29330?",
        "a": "29330 is a spherical roller thrust bearing to ISO 104: 150 mm shaft-washer bore, 250 mm outside diameter, 60 mm stack height (5.906 x 9.843 x 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 750 kN, C0a 2390 kN and a 191 kN fatigue load limit Pu; limiting speed 1,400 r/min with oil lubrication; mass about 12000 g."
      },
      {
        "q": "How is the 29330 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 30 encodes the 150 mm bore (bore code x 5). The 250 mm OD and 60 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29330 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,400 r/min, for 29330?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29330?",
        "a": "The 150/250/60 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 750 kN / C0a 2390 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29330-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×250×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29330"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29430",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29430",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 150,
    "D_mm": 300,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1430,
    "static_load_kN": 4350,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 280,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1100,
    "weight_g": 30500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 29430 appears as a heavy-section 29400 spherical-thrust family bearing with a 150 mm shaft washer, 300 mm across the housing washer and 90 mm of height. NTN builds the number from 294 is the dimension series (heavy-section 29400 spherical-thrust family); 30 encodes the 150 mm bore (bore code x 5). With Ca 1430 kN and C0a 4350 kN, each mm of bore carries about 9.53 kN of dynamic axial rating. Where the shaft also needs radial location, pair this bearing with a spherical roller or cylindrical radial bearing — the thrust bearing is not a radial guide. On vertical shafts, confirm the minimum axial load from the rotor weight plus any spring preload before the first run at speed. ",
    "applications": [
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact"
    ],
    "pitfalls": [
      "At 150 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 300 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "The C0a of 4350 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "The Ca 1430/C0a 4350 kN ratings and 280 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29430; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29430?",
        "a": "29430 is a spherical roller thrust bearing to ISO 104: 150 mm shaft-washer bore, 300 mm outside diameter, 90 mm stack height (5.906 x 11.811 x 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1430 kN, C0a 4350 kN and a 280 kN fatigue load limit Pu; limiting speed 1,100 r/min with oil lubrication; mass about 30500 g."
      },
      {
        "q": "How is the 29430 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 30 encodes the 150 mm bore (bore code x 5). The 300 mm OD and 90 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29430 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,100 r/min, for 29430?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29430?",
        "a": "The 150/300/90 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1430 kN / C0a 4350 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29430-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×300×90 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29430"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29232",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29232",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 160,
    "D_mm": 225,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 400,
    "static_load_kN": 1460,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 126,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 1700,
    "weight_g": 4880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "From the light-section 29200 spherical-thrust family, 29232 measures 160 mm through the shaft washer, 225 mm over the outside and 39 mm in assembled height. Decoding 29232: 292 is the dimension series (light-section 29200 spherical-thrust family), with 32 encodes the 160 mm bore (bore code x 5). Catalogue axial dynamic rating Ca is 400 kN against C0a 1460 kN — the roller contact line is why a 160 mm bore here out-carries any thrust ball bearing of the same size. Selection starts from the load case: axial must dominate, and any radial share must stay within the catalogue combined-load rule while the bearing self-aligns. Fill the housing with the specified oil to the level that reaches the cage — these bearings are oil-bath or circulation machines, not grease machines. ",
    "applications": [
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces"
    ],
    "pitfalls": [
      "At 160 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 160 mm bore it trades capacity for a smaller 225 mm OD and lower height.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29232 was chosen for.",
      "The C0a of 1460 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "Below the minimum axial load the rollers skid; at 1,700 r/min the Ca of 400 kN never comes into play before the raceway is smeared.",
      "The Ca 400/C0a 1460 kN ratings and 126 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29232; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29232?",
        "a": "29232 is a spherical roller thrust bearing to ISO 104: 160 mm shaft-washer bore, 225 mm outside diameter, 39 mm stack height (6.299 x 8.858 x 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 400 kN, C0a 1460 kN and a 126 kN fatigue load limit Pu; limiting speed 1,700 r/min with oil lubrication; mass about 4880 g."
      },
      {
        "q": "How is the 29232 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 32 encodes the 160 mm bore (bore code x 5). The 225 mm OD and 39 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29232 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,700 r/min, for 29232?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29232?",
        "a": "The 160/225/39 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 400 kN / C0a 1460 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29332",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29332",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 915,
    "static_load_kN": 2860,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 223,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1300,
    "weight_g": 15900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 29332 appears as a medium-section 29300 spherical-thrust family bearing with a 160 mm shaft washer, 270 mm across the housing washer and 67 mm of height. Two fields make up the code — 293 is the dimension series (medium-section 29300 spherical-thrust family) and 32 encodes the 160 mm bore (bore code x 5). At 67 mm of height the bearing packs the medium-section capacity into a stack far shorter than a comparable multi-row ball arrangement. If speed climbs toward the 1,300 r/min oil rating, the lubrication design — bath, circulation, cooling — becomes the real selection criterion. Fill the housing with the specified oil to the level that reaches the cage — these bearings are oil-bath or circulation machines, not grease machines. ",
    "applications": [
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation"
    ],
    "pitfalls": [
      "At 160 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 160 mm bore.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The Ca 915/C0a 2860 kN ratings and 223 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29332; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29332?",
        "a": "29332 is a spherical roller thrust bearing to ISO 104: 160 mm shaft-washer bore, 270 mm outside diameter, 67 mm stack height (6.299 x 10.63 x 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 915 kN, C0a 2860 kN and a 223 kN fatigue load limit Pu; limiting speed 1,300 r/min with oil lubrication; mass about 15900 g."
      },
      {
        "q": "How is the 29332 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 32 encodes the 160 mm bore (bore code x 5). The 270 mm OD and 67 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29332 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,300 r/min, for 29332?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29332?",
        "a": "The 160/270/67 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 915 kN / C0a 2860 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29332-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×270×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29432",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29432",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 160,
    "D_mm": 320,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1670,
    "static_load_kN": 5150,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 320,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1000,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy-section 29400 spherical-thrust family entry 29432 combines a spherical housing-washer raceway with asymmetric barrel rollers in 95 mm of stack height. Reading the code: 294 is the dimension series (heavy-section 29400 spherical-thrust family), and 32 encodes the 160 mm bore (bore code x 5). The single printed speed, 1,000 r/min, is an oil-lubrication figure: the catalogue greases these bearings only for the smallest duties, and this size is rated for oil. Choose the heavy-section 29400 spherical-thrust family when heavy thrust meets misalignment: vertical turbines, mills and slew pivots are the classic homes. The 160 mm shaft washer normally mounts with a tight shaft fit; support the housing washer so it stays free to align on its spherical seat. ",
    "applications": [
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 160 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 320 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Shock thrust above C0a 5150 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 1,000 r/min end of the range.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 1,000 r/min end of the range.",
      "The Ca 1670/C0a 5150 kN ratings and 320 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29432; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29432?",
        "a": "29432 is a spherical roller thrust bearing to ISO 104: 160 mm shaft-washer bore, 320 mm outside diameter, 95 mm stack height (6.299 x 12.598 x 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1670 kN, C0a 5150 kN and a 320 kN fatigue load limit Pu; limiting speed 1,000 r/min with oil lubrication; mass about 37000 g."
      },
      {
        "q": "How is the 29432 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 32 encodes the 160 mm bore (bore code x 5). The 320 mm OD and 95 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29432 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,000 r/min, for 29432?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29432?",
        "a": "The 160/320/95 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1670 kN / C0a 5150 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29432-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×320×95 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=228",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29432"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29234",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29234",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 170,
    "D_mm": 240,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 475,
    "static_load_kN": 1770,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 146,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1600,
    "weight_g": 6020,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 29234 appears as a light-section 29200 spherical-thrust family bearing with a 170 mm shaft washer, 240 mm across the housing washer and 42 mm of height. The designation is 292 is the dimension series (light-section 29200 spherical-thrust family) plus 34 encodes the 170 mm bore (bore code x 5). NTN prints 475 kN axial dynamic and 1770 kN axial static for this size and a 146 kN fatigue load limit Pu. Minimum axial load matters here too: at speed the rollers skid on a lightly loaded bearing, so check the catalogue minimum-load formula before downsizing the thrust spring. On vertical shafts, confirm the minimum axial load from the rotor weight plus any spring preload before the first run at speed. ",
    "applications": [
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "At 170 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 170 mm bore it trades capacity for a smaller 240 mm OD and lower height.",
      "The C0a of 1770 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29234 stack as a set.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29234 stack as a set.",
      "The Ca 475/C0a 1770 kN ratings and 146 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29234; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29234?",
        "a": "29234 is a spherical roller thrust bearing to ISO 104: 170 mm shaft-washer bore, 240 mm outside diameter, 42 mm stack height (6.693 x 9.449 x 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 475 kN, C0a 1770 kN and a 146 kN fatigue load limit Pu; limiting speed 1,600 r/min with oil lubrication; mass about 6020 g."
      },
      {
        "q": "How is the 29234 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 34 encodes the 170 mm bore (bore code x 5). The 240 mm OD and 42 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29234 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,600 r/min, for 29234?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29234?",
        "a": "The 170/240/42 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 475 kN / C0a 1770 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29334",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29334",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 950,
    "static_load_kN": 3050,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 238,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1200,
    "weight_g": 16600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The medium-section 29300 spherical-thrust family entry 29334 combines a spherical housing-washer raceway with asymmetric barrel rollers in 67 mm of stack height. NTN builds the number from 293 is the dimension series (medium-section 29300 spherical-thrust family); 34 encodes the 170 mm bore (bore code x 5). The spherical housing raceway lets the shaft washer align itself as the seats settle — the property that keeps the 3050 kN static rating honest in real housings. Selection starts from the load case: axial must dominate, and any radial share must stay within the catalogue combined-load rule while the bearing self-aligns. On vertical shafts, confirm the minimum axial load from the rotor weight plus any spring preload before the first run at speed. ",
    "applications": [
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact"
    ],
    "pitfalls": [
      "At 170 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 170 mm bore.",
      "Below the minimum axial load the rollers skid; at 1,200 r/min the Ca of 950 kN never comes into play before the raceway is smeared.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 1,200 r/min end of the range.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "The Ca 950/C0a 3050 kN ratings and 238 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29334; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29334?",
        "a": "29334 is a spherical roller thrust bearing to ISO 104: 170 mm shaft-washer bore, 280 mm outside diameter, 67 mm stack height (6.693 x 11.024 x 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 950 kN, C0a 3050 kN and a 238 kN fatigue load limit Pu; limiting speed 1,200 r/min with oil lubrication; mass about 16600 g."
      },
      {
        "q": "How is the 29334 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 34 encodes the 170 mm bore (bore code x 5). The 280 mm OD and 67 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29334 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,200 r/min, for 29334?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29334?",
        "a": "The 170/280/67 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 950 kN / C0a 3050 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29334-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×280×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29434",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29434",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 170,
    "D_mm": 340,
    "B_mm": 103,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1840,
    "static_load_kN": 5750,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 345,
    "limiting_speed_rpm": 940,
    "max_rpm": 940,
    "speed_oil_rpm": 940,
    "weight_g": 45000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29434 is the 170 mm member of NTN's heavy-section 29400 spherical-thrust family: 340 mm over the housing washer, 103 mm tall. Decoding 29434: 294 is the dimension series (heavy-section 29400 spherical-thrust family), with 34 encodes the 170 mm bore (bore code x 5). The static/dynamic ratio of 3.13 tells the story of a roller raceway: enormous reserve for slow, shocked or oscillating thrust. The 170/340/103 envelope follows ISO 104, so dimensional interchange holds between makers; osculation, roller profile and ratings do not automatically follow. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat. ",
    "applications": [
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces"
    ],
    "pitfalls": [
      "At 170 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 340 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "Shock thrust above C0a 5750 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "The Ca 1840/C0a 5750 kN ratings and 345 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29434; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29434?",
        "a": "29434 is a spherical roller thrust bearing to ISO 104: 170 mm shaft-washer bore, 340 mm outside diameter, 103 mm stack height (6.693 x 13.386 x 4.055 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1840 kN, C0a 5750 kN and a 345 kN fatigue load limit Pu; limiting speed 940 r/min with oil lubrication; mass about 45000 g."
      },
      {
        "q": "How is the 29434 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 34 encodes the 170 mm bore (bore code x 5). The 340 mm OD and 103 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29434 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 940 r/min, for 29434?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29434?",
        "a": "The 170/340/103 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1840 kN / C0a 5750 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29434-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×340×103 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29434"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29236",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29236",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 500,
    "static_load_kN": 1920,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1600,
    "weight_g": 6270,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light-section 29200 spherical-thrust family entry 29236 combines a spherical housing-washer raceway with asymmetric barrel rollers in 42 mm of stack height. Two fields make up the code — 292 is the dimension series (light-section 29200 spherical-thrust family) and 36 encodes the 180 mm bore (bore code x 5). Asymmetric rollers and the angled contact mean the bearing also tolerates radial load — the catalogue allows a radial share while axial load clearly dominates. Within the spherical-thrust plan, 292 is the light section and 294 the heavy one; stepping up from a 292 to a 294 at the same bore roughly doubles the C0a class. The 180 mm shaft washer normally mounts with a tight shaft fit; support the housing washer so it stays free to align on its spherical seat. ",
    "applications": [
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation"
    ],
    "pitfalls": [
      "At 180 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 180 mm bore it trades capacity for a smaller 250 mm OD and lower height.",
      "The 42 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The 42 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "Shock thrust above C0a 1920 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "The Ca 500/C0a 1920 kN ratings and 160 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29236; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29236?",
        "a": "29236 is a spherical roller thrust bearing to ISO 104: 180 mm shaft-washer bore, 250 mm outside diameter, 42 mm stack height (7.087 x 9.843 x 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 500 kN, C0a 1920 kN and a 160 kN fatigue load limit Pu; limiting speed 1,600 r/min with oil lubrication; mass about 6270 g."
      },
      {
        "q": "How is the 29236 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 36 encodes the 180 mm bore (bore code x 5). The 250 mm OD and 42 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29236 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,600 r/min, for 29236?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29236?",
        "a": "The 180/250/42 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 500 kN / C0a 1920 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29236-E",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29336",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29336",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1110,
    "static_load_kN": 3600,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 272,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1100,
    "weight_g": 21200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29336 is the 180 mm member of NTN's medium-section 29300 spherical-thrust family: 300 mm over the housing washer, 73 mm tall. Reading the code: 293 is the dimension series (medium-section 29300 spherical-thrust family), and 36 encodes the 180 mm bore (bore code x 5). Catalogue mass is about 21 kg for the full washer-and-roller stack. Minimum axial load matters here too: at speed the rollers skid on a lightly loaded bearing, so check the catalogue minimum-load formula before downsizing the thrust spring. The 180 mm shaft washer normally mounts with a tight shaft fit; support the housing washer so it stays free to align on its spherical seat. ",
    "applications": [
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 180 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 180 mm bore.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 1,100 r/min end of the range.",
      "Shock thrust above C0a 3600 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "The 73 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 1110/C0a 3600 kN ratings and 272 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29336; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29336?",
        "a": "29336 is a spherical roller thrust bearing to ISO 104: 180 mm shaft-washer bore, 300 mm outside diameter, 73 mm stack height (7.087 x 11.811 x 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1110 kN, C0a 3600 kN and a 272 kN fatigue load limit Pu; limiting speed 1,100 r/min with oil lubrication; mass about 21200 g."
      },
      {
        "q": "How is the 29336 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 36 encodes the 180 mm bore (bore code x 5). The 300 mm OD and 73 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29336 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,100 r/min, for 29336?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29336?",
        "a": "The 180/300/73 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1110 kN / C0a 3600 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29336-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×300×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29436",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29436",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 180,
    "D_mm": 360,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 2050,
    "static_load_kN": 6200,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 400,
    "limiting_speed_rpm": 890,
    "max_rpm": 890,
    "speed_oil_rpm": 890,
    "weight_g": 52900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29436 is an NTN spherical roller thrust bearing of the heavy-section 29400 spherical-thrust family: 180 mm bore, 360 mm outside diameter, 109 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 36 encodes the 180 mm bore (bore code x 5). At 109 mm of height the bearing packs the heavy-section capacity into a stack far shorter than a comparable multi-row ball arrangement. Against a thrust ball bearing of the same 180 mm bore, this bearing carries many times the load at lower speed — the trade is oil lubrication and price. After filling with oil, rotate slowly and watch torque and temperature; a misrouted oil feed shows up in the first minutes of running. ",
    "applications": [
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "At 180 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 360 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29436 stack as a set.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29436 was chosen for.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The Ca 2050/C0a 6200 kN ratings and 400 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29436; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29436?",
        "a": "29436 is a spherical roller thrust bearing to ISO 104: 180 mm shaft-washer bore, 360 mm outside diameter, 109 mm stack height (7.087 x 14.173 x 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2050 kN, C0a 6200 kN and a 400 kN fatigue load limit Pu; limiting speed 890 r/min with oil lubrication; mass about 52900 g."
      },
      {
        "q": "How is the 29436 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 36 encodes the 180 mm bore (bore code x 5). The 360 mm OD and 109 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29436 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 890 r/min, for 29436?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29436?",
        "a": "The 180/360/109 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2050 kN / C0a 6200 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29436-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×360×109 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29436"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29238",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29238",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 190,
    "D_mm": 270,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 585,
    "static_load_kN": 2230,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 184,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1400,
    "weight_g": 8800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29238 is the 190 mm member of NTN's light-section 29200 spherical-thrust family: 270 mm over the housing washer, 48 mm tall. NTN builds the number from 292 is the dimension series (light-section 29200 spherical-thrust family); 38 encodes the 190 mm bore (bore code x 5). A machined cage guided on the shaft-washer sleeve keeps the roller set spaced at the 1,400 r/min oil rating. For oscillating or slow heavy duty, size from C0a 2230 kN with the static safety factor rather than from the life equation. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat. ",
    "applications": [
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact"
    ],
    "pitfalls": [
      "At 190 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 190 mm bore it trades capacity for a smaller 270 mm OD and lower height.",
      "Oil is not optional at this rating: the 1,400 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "Oil is not optional at this rating: the 1,400 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "The Ca 585/C0a 2230 kN ratings and 184 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29238; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29238?",
        "a": "29238 is a spherical roller thrust bearing to ISO 104: 190 mm shaft-washer bore, 270 mm outside diameter, 48 mm stack height (7.48 x 10.63 x 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 585 kN, C0a 2230 kN and a 184 kN fatigue load limit Pu; limiting speed 1,400 r/min with oil lubrication; mass about 8800 g."
      },
      {
        "q": "How is the 29238 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 38 encodes the 190 mm bore (bore code x 5). The 270 mm OD and 48 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29238 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,400 r/min, for 29238?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29238?",
        "a": "The 190/270/48 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 585 kN / C0a 2230 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29338",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29338",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1280,
    "static_load_kN": 4250,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 294,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1100,
    "weight_g": 26000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29338 is an NTN spherical roller thrust bearing of the medium-section 29300 spherical-thrust family: 190 mm bore, 320 mm outside diameter, 78 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Decoding 29338: 293 is the dimension series (medium-section 29300 spherical-thrust family), with 38 encodes the 190 mm bore (bore code x 5). Shaft and housing washers separate, so the 190 mm shaft washer can be mounted on the shaft before the roller set and housing washer follow. Within the spherical-thrust plan, 292 is the light section and 294 the heavy one; stepping up from a 292 to a 294 at the same bore roughly doubles the C0a class. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat. ",
    "applications": [
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces"
    ],
    "pitfalls": [
      "At 190 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 190 mm bore.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29338 was chosen for.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29338 was chosen for.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29338 was chosen for.",
      "The Ca 1280/C0a 4250 kN ratings and 294 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29338; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29338?",
        "a": "29338 is a spherical roller thrust bearing to ISO 104: 190 mm shaft-washer bore, 320 mm outside diameter, 78 mm stack height (7.48 x 12.598 x 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1280 kN, C0a 4250 kN and a 294 kN fatigue load limit Pu; limiting speed 1,100 r/min with oil lubrication; mass about 26000 g."
      },
      {
        "q": "How is the 29338 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 38 encodes the 190 mm bore (bore code x 5). The 320 mm OD and 78 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29338 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,100 r/min, for 29338?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29338?",
        "a": "The 190/320/78 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1280 kN / C0a 4250 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29338-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×320×78 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29438",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29438",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 190,
    "D_mm": 380,
    "B_mm": 115,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 2230,
    "static_load_kN": 6800,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 430,
    "limiting_speed_rpm": 840,
    "max_rpm": 840,
    "speed_oil_rpm": 840,
    "weight_g": 62000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "NTN 29438 belongs to the heavy-section 29400 spherical-thrust family of spherical roller thrust bearings: 190 / 380 / 115 mm (bore / OD / height). Two fields make up the code — 294 is the dimension series (heavy-section 29400 spherical-thrust family) and 38 encodes the 190 mm bore (bore code x 5). The spherical housing raceway lets the shaft washer align itself as the seats settle — the property that keeps the 6800 kN static rating honest in real housings. If speed climbs toward the 840 r/min oil rating, the lubrication design — bath, circulation, cooling — becomes the real selection criterion. Lift the bearing by the washers, never through the roller set; a 62 kg stack punishes improvisation. ",
    "applications": [
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation"
    ],
    "pitfalls": [
      "At 190 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 380 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "The Ca 2230/C0a 6800 kN ratings and 430 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29438; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29438?",
        "a": "29438 is a spherical roller thrust bearing to ISO 104: 190 mm shaft-washer bore, 380 mm outside diameter, 115 mm stack height (7.48 x 14.961 x 4.528 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2230 kN, C0a 6800 kN and a 430 kN fatigue load limit Pu; limiting speed 840 r/min with oil lubrication; mass about 62000 g."
      },
      {
        "q": "How is the 29438 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 38 encodes the 190 mm bore (bore code x 5). The 380 mm OD and 115 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29438 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 840 r/min, for 29438?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29438?",
        "a": "The 190/380/115 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2230 kN / C0a 6800 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29438-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×380×115 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29438"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29240",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29240",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 595,
    "static_load_kN": 2300,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 183,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1400,
    "weight_g": 9140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29240 is an NTN spherical roller thrust bearing of the light-section 29200 spherical-thrust family: 200 mm bore, 280 mm outside diameter, 48 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Decoding 29240: 292 is the dimension series (light-section 29200 spherical-thrust family), with 40 encodes the 200 mm bore (bore code x 5). Catalogue axial dynamic rating Ca is 595 kN against C0a 2300 kN — the roller contact line is why a 200 mm bore here out-carries any thrust ball bearing of the same size. Minimum axial load matters here too: at speed the rollers skid on a lightly loaded bearing, so check the catalogue minimum-load formula before downsizing the thrust spring. The 200 mm shaft washer normally mounts with a tight shaft fit; support the housing washer so it stays free to align on its spherical seat. ",
    "applications": [
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces"
    ],
    "pitfalls": [
      "At 200 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 200 mm bore it trades capacity for a smaller 280 mm OD and lower height.",
      "The C0a of 2300 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "Oil is not optional at this rating: the 1,400 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "Below the minimum axial load the rollers skid; at 1,400 r/min the Ca of 595 kN never comes into play before the raceway is smeared.",
      "The Ca 595/C0a 2300 kN ratings and 183 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29240; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29240?",
        "a": "29240 is a spherical roller thrust bearing to ISO 104: 200 mm shaft-washer bore, 280 mm outside diameter, 48 mm stack height (7.874 x 11.024 x 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 595 kN, C0a 2300 kN and a 183 kN fatigue load limit Pu; limiting speed 1,400 r/min with oil lubrication; mass about 9140 g."
      },
      {
        "q": "How is the 29240 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 40 encodes the 200 mm bore (bore code x 5). The 280 mm OD and 48 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29240 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,400 r/min, for 29240?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29240?",
        "a": "The 200/280/48 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 595 kN / C0a 2300 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29240-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×280×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29340",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29340",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1420,
    "static_load_kN": 4600,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 330,
    "limiting_speed_rpm": 980,
    "max_rpm": 980,
    "speed_oil_rpm": 980,
    "weight_g": 31900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "NTN 29340 belongs to the medium-section 29300 spherical-thrust family of spherical roller thrust bearings: 200 / 340 / 85 mm (bore / OD / height). Two fields make up the code — 293 is the dimension series (medium-section 29300 spherical-thrust family) and 40 encodes the 200 mm bore (bore code x 5). At 85 mm of height the bearing packs the medium-section capacity into a stack far shorter than a comparable multi-row ball arrangement. Selection starts from the load case: axial must dominate, and any radial share must stay within the catalogue combined-load rule while the bearing self-aligns. The 200 mm shaft washer normally mounts with a tight shaft fit; support the housing washer so it stays free to align on its spherical seat. ",
    "applications": [
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation"
    ],
    "pitfalls": [
      "At 200 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 200 mm bore.",
      "Below the minimum axial load the rollers skid; at 980 r/min the Ca of 1420 kN never comes into play before the raceway is smeared.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The Ca 1420/C0a 4600 kN ratings and 330 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29340; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29340?",
        "a": "29340 is a spherical roller thrust bearing to ISO 104: 200 mm shaft-washer bore, 340 mm outside diameter, 85 mm stack height (7.874 x 13.386 x 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1420 kN, C0a 4600 kN and a 330 kN fatigue load limit Pu; limiting speed 980 r/min with oil lubrication; mass about 31900 g."
      },
      {
        "q": "How is the 29340 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 40 encodes the 200 mm bore (bore code x 5). The 340 mm OD and 85 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29340 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 980 r/min, for 29340?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29340?",
        "a": "The 200/340/85 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1420 kN / C0a 4600 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29340-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×340×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29440",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29440",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 200,
    "D_mm": 400,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 2490,
    "static_load_kN": 7650,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 465,
    "limiting_speed_rpm": 790,
    "max_rpm": 790,
    "speed_oil_rpm": 790,
    "weight_g": 73300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "At 200 x 400 x 122 mm, NTN 29440 sits in the heavy-section 29400 spherical-thrust family of the spherical-thrust programme. Reading the code: 294 is the dimension series (heavy-section 29400 spherical-thrust family), and 40 encodes the 200 mm bore (bore code x 5). The single printed speed, 790 r/min, is an oil-lubrication figure: the catalogue greases these bearings only for the smallest duties, and this size is rated for oil. The 200/400/122 envelope follows ISO 104, so dimensional interchange holds between makers; osculation, roller profile and ratings do not automatically follow. After filling with oil, rotate slowly and watch torque and temperature; a misrouted oil feed shows up in the first minutes of running. ",
    "applications": [
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 200 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 400 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The C0a of 7650 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 790 r/min end of the range.",
      "The Ca 2490/C0a 7650 kN ratings and 465 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29440; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29440?",
        "a": "29440 is a spherical roller thrust bearing to ISO 104: 200 mm shaft-washer bore, 400 mm outside diameter, 122 mm stack height (7.874 x 15.748 x 4.803 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2490 kN, C0a 7650 kN and a 465 kN fatigue load limit Pu; limiting speed 790 r/min with oil lubrication; mass about 73300 g."
      },
      {
        "q": "How is the 29440 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 40 encodes the 200 mm bore (bore code x 5). The 400 mm OD and 122 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29440 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 790 r/min, for 29440?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29440?",
        "a": "The 200/400/122 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2490 kN / C0a 7650 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29440-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×400×122 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29440"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29244",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29244",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 620,
    "static_load_kN": 2480,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 198,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1300,
    "weight_g": 9940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "At 220 x 300 x 48 mm, NTN 29244 sits in the light-section 29200 spherical-thrust family of the spherical-thrust programme. Two fields make up the code — 292 is the dimension series (light-section 29200 spherical-thrust family) and 44 encodes the 220 mm bore (bore code x 5). Asymmetric rollers and the angled contact mean the bearing also tolerates radial load — the catalogue allows a radial share while axial load clearly dominates. For oscillating or slow heavy duty, size from C0a 2480 kN with the static safety factor rather than from the life equation. After filling with oil, rotate slowly and watch torque and temperature; a misrouted oil feed shows up in the first minutes of running. ",
    "applications": [
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation"
    ],
    "pitfalls": [
      "At 220 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 220 mm bore it trades capacity for a smaller 300 mm OD and lower height.",
      "Oil is not optional at this rating: the 1,300 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "Shock thrust above C0a 2480 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "The Ca 620/C0a 2480 kN ratings and 198 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29244; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29244?",
        "a": "29244 is a spherical roller thrust bearing to ISO 104: 220 mm shaft-washer bore, 300 mm outside diameter, 48 mm stack height (8.661 x 11.811 x 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 620 kN, C0a 2480 kN and a 198 kN fatigue load limit Pu; limiting speed 1,300 r/min with oil lubrication; mass about 9940 g."
      },
      {
        "q": "How is the 29244 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 44 encodes the 220 mm bore (bore code x 5). The 300 mm OD and 48 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29244 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,300 r/min, for 29244?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29244?",
        "a": "The 220/300/48 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 620 kN / C0a 2480 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29244-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×300×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29344",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29344",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 220,
    "D_mm": 360,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1540,
    "static_load_kN": 5200,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 360,
    "limiting_speed_rpm": 940,
    "max_rpm": 940,
    "speed_oil_rpm": 940,
    "weight_g": 34500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "From the medium-section 29300 spherical-thrust family, 29344 measures 220 mm through the shaft washer, 360 mm over the outside and 85 mm in assembled height. Reading the code: 293 is the dimension series (medium-section 29300 spherical-thrust family), and 44 encodes the 220 mm bore (bore code x 5). Catalogue mass is about 35 kg for the full washer-and-roller stack. Within the spherical-thrust plan, 292 is the light section and 294 the heavy one; stepping up from a 292 to a 294 at the same bore roughly doubles the C0a class. After filling with oil, rotate slowly and watch torque and temperature; a misrouted oil feed shows up in the first minutes of running. ",
    "applications": [
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 220 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 220 mm bore.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29344 was chosen for.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29344 stack as a set.",
      "The 85 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 1540/C0a 5200 kN ratings and 360 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29344; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29344?",
        "a": "29344 is a spherical roller thrust bearing to ISO 104: 220 mm shaft-washer bore, 360 mm outside diameter, 85 mm stack height (8.661 x 14.173 x 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1540 kN, C0a 5200 kN and a 360 kN fatigue load limit Pu; limiting speed 940 r/min with oil lubrication; mass about 34500 g."
      },
      {
        "q": "How is the 29344 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 44 encodes the 220 mm bore (bore code x 5). The 360 mm OD and 85 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29344 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 940 r/min, for 29344?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29344?",
        "a": "The 220/360/85 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1540 kN / C0a 5200 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29344-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×360×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29444",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29444",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 220,
    "D_mm": 420,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 2560,
    "static_load_kN": 8100,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 505,
    "limiting_speed_rpm": 760,
    "max_rpm": 760,
    "speed_oil_rpm": 760,
    "weight_g": 77800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 29444 appears as a heavy-section 29400 spherical-thrust family bearing with a 220 mm shaft washer, 420 mm across the housing washer and 122 mm of height. The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 44 encodes the 220 mm bore (bore code x 5). At 122 mm of height the bearing packs the heavy-section capacity into a stack far shorter than a comparable multi-row ball arrangement. If speed climbs toward the 760 r/min oil rating, the lubrication design — bath, circulation, cooling — becomes the real selection criterion. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 2560 kN class thrust. ",
    "applications": [
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "At 220 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 420 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "The 122 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The Ca 2560/C0a 8100 kN ratings and 505 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29444; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29444?",
        "a": "29444 is a spherical roller thrust bearing to ISO 104: 220 mm shaft-washer bore, 420 mm outside diameter, 122 mm stack height (8.661 x 16.535 x 4.803 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2560 kN, C0a 8100 kN and a 505 kN fatigue load limit Pu; limiting speed 760 r/min with oil lubrication; mass about 77800 g."
      },
      {
        "q": "How is the 29444 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 44 encodes the 220 mm bore (bore code x 5). The 420 mm OD and 122 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29444 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 760 r/min, for 29444?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29444?",
        "a": "The 220/420/122 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2560 kN / C0a 8100 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29444-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×420×122 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29444"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29248-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29248",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 240,
    "D_mm": 340,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 890,
    "static_load_kN": 3600,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 271,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1100,
    "weight_g": 17500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "At 240 x 340 x 60 mm, NTN 29248 sits in the light-section 29200 spherical-thrust family of the spherical-thrust programme. Reading the code: 292 is the dimension series (light-section 29200 spherical-thrust family), and 48 encodes the 240 mm bore (bore code x 5). At 60 mm of height the bearing packs the light-section capacity into a stack far shorter than a comparable multi-row ball arrangement. If speed climbs toward the 1,100 r/min oil rating, the lubrication design — bath, circulation, cooling — becomes the real selection criterion. The 240 mm shaft washer normally mounts with a tight shaft fit; support the housing washer so it stays free to align on its spherical seat. ",
    "applications": [
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 240 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 240 mm bore it trades capacity for a smaller 340 mm OD and lower height.",
      "Shock thrust above C0a 3600 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "Below the minimum axial load the rollers skid; at 1,100 r/min the Ca of 890 kN never comes into play before the raceway is smeared.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The Ca 890/C0a 3600 kN ratings and 271 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29248; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29248?",
        "a": "29248 is a spherical roller thrust bearing to ISO 104: 240 mm shaft-washer bore, 340 mm outside diameter, 60 mm stack height (9.449 x 13.386 x 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 890 kN, C0a 3600 kN and a 271 kN fatigue load limit Pu; limiting speed 1,100 r/min with oil lubrication; mass about 17500 g."
      },
      {
        "q": "How is the 29248 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 48 encodes the 240 mm bore (bore code x 5). The 340 mm OD and 60 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29248 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,100 r/min, for 29248?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29248?",
        "a": "The 240/340/60 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 890 kN / C0a 3600 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29248",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×340×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29248",
      "29248-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29348",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29348",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 240,
    "D_mm": 380,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1530,
    "static_load_kN": 5250,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 390,
    "limiting_speed_rpm": 910,
    "max_rpm": 910,
    "speed_oil_rpm": 910,
    "weight_g": 36600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The medium-section 29300 spherical-thrust family entry 29348 combines a spherical housing-washer raceway with asymmetric barrel rollers in 85 mm of stack height. The designation is 293 is the dimension series (medium-section 29300 spherical-thrust family) plus 48 encodes the 240 mm bore (bore code x 5). Catalogue axial dynamic rating Ca is 1530 kN against C0a 5250 kN — the roller contact line is why a 240 mm bore here out-carries any thrust ball bearing of the same size. Where the shaft also needs radial location, pair this bearing with a spherical roller or cylindrical radial bearing — the thrust bearing is not a radial guide. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 1530 kN class thrust. ",
    "applications": [
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "At 240 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 240 mm bore.",
      "The 85 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "Below the minimum axial load the rollers skid; at 910 r/min the Ca of 1530 kN never comes into play before the raceway is smeared.",
      "The Ca 1530/C0a 5250 kN ratings and 390 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29348; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29348?",
        "a": "29348 is a spherical roller thrust bearing to ISO 104: 240 mm shaft-washer bore, 380 mm outside diameter, 85 mm stack height (9.449 x 14.961 x 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1530 kN, C0a 5250 kN and a 390 kN fatigue load limit Pu; limiting speed 910 r/min with oil lubrication; mass about 36600 g."
      },
      {
        "q": "How is the 29348 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 48 encodes the 240 mm bore (bore code x 5). The 380 mm OD and 85 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29348 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 910 r/min, for 29348?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29348?",
        "a": "The 240/380/85 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1530 kN / C0a 5250 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29348-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×380×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29448",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29448",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 2680,
    "static_load_kN": 8700,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 740,
    "max_rpm": 740,
    "speed_oil_rpm": 740,
    "weight_g": 82600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29448 is the 240 mm member of NTN's heavy-section 29400 spherical-thrust family: 440 mm over the housing washer, 122 mm tall. NTN builds the number from 294 is the dimension series (heavy-section 29400 spherical-thrust family); 48 encodes the 240 mm bore (bore code x 5). Catalogue mass is about 83 kg for the full washer-and-roller stack. Minimum axial load matters here too: at speed the rollers skid on a lightly loaded bearing, so check the catalogue minimum-load formula before downsizing the thrust spring. On vertical shafts, confirm the minimum axial load from the rotor weight plus any spring preload before the first run at speed. ",
    "applications": [
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact"
    ],
    "pitfalls": [
      "At 240 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 440 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 740 r/min end of the range.",
      "Oil is not optional at this rating: the 740 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "The 122 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 2680/C0a 8700 kN ratings and 530 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29448; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29448?",
        "a": "29448 is a spherical roller thrust bearing to ISO 104: 240 mm shaft-washer bore, 440 mm outside diameter, 122 mm stack height (9.449 x 17.323 x 4.803 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2680 kN, C0a 8700 kN and a 530 kN fatigue load limit Pu; limiting speed 740 r/min with oil lubrication; mass about 82600 g."
      },
      {
        "q": "How is the 29448 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 48 encodes the 240 mm bore (bore code x 5). The 440 mm OD and 122 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29448 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 740 r/min, for 29448?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29448?",
        "a": "The 240/440/122 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2680 kN / C0a 8700 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29448-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×440×122 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29448"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29252-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29252",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 960,
    "static_load_kN": 3950,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 296,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1100,
    "weight_g": 18600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "NTN 29252 belongs to the light-section 29200 spherical-thrust family of spherical roller thrust bearings: 260 / 360 / 60 mm (bore / OD / height). Reading the code: 292 is the dimension series (light-section 29200 spherical-thrust family), and 52 encodes the 260 mm bore (bore code x 5). With Ca 960 kN and C0a 3950 kN, each mm of bore carries about 3.69 kN of dynamic axial rating. Choose the light-section 29200 spherical-thrust family when heavy thrust meets misalignment: vertical turbines, mills and slew pivots are the classic homes. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 960 kN class thrust. ",
    "applications": [
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 260 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 260 mm bore it trades capacity for a smaller 360 mm OD and lower height.",
      "The 60 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "Below the minimum axial load the rollers skid; at 1,100 r/min the Ca of 960 kN never comes into play before the raceway is smeared.",
      "The C0a of 3950 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "The Ca 960/C0a 3950 kN ratings and 296 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29252; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29252?",
        "a": "29252 is a spherical roller thrust bearing to ISO 104: 260 mm shaft-washer bore, 360 mm outside diameter, 60 mm stack height (10.236 x 14.173 x 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 960 kN, C0a 3950 kN and a 296 kN fatigue load limit Pu; limiting speed 1,100 r/min with oil lubrication; mass about 18600 g."
      },
      {
        "q": "How is the 29252 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 52 encodes the 260 mm bore (bore code x 5). The 360 mm OD and 60 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29252 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,100 r/min, for 29252?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29252?",
        "a": "The 260/360/60 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 960 kN / C0a 3950 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29252",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×360×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29252",
      "29252-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29352",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29352",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 260,
    "D_mm": 420,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1910,
    "static_load_kN": 6800,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 445,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 810,
    "weight_g": 52000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29352 is an NTN spherical roller thrust bearing of the medium-section 29300 spherical-thrust family: 260 mm bore, 420 mm outside diameter, 95 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Reading the code: 293 is the dimension series (medium-section 29300 spherical-thrust family), and 52 encodes the 260 mm bore (bore code x 5). Catalogue mass is about 52 kg for the full washer-and-roller stack. For oscillating or slow heavy duty, size from C0a 6800 kN with the static safety factor rather than from the life equation. Torque the shaft nut against the shaft washer shoulder and verify axial clamping — a loose shaft washer frets the seat under 1910 kN class thrust. ",
    "applications": [
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 260 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 260 mm bore.",
      "The C0a of 6800 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "Below the minimum axial load the rollers skid; at 810 r/min the Ca of 1910 kN never comes into play before the raceway is smeared.",
      "The 95 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 1910/C0a 6800 kN ratings and 445 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29352; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29352?",
        "a": "29352 is a spherical roller thrust bearing to ISO 104: 260 mm shaft-washer bore, 420 mm outside diameter, 95 mm stack height (10.236 x 16.535 x 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1910 kN, C0a 6800 kN and a 445 kN fatigue load limit Pu; limiting speed 810 r/min with oil lubrication; mass about 52000 g."
      },
      {
        "q": "How is the 29352 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 52 encodes the 260 mm bore (bore code x 5). The 420 mm OD and 95 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29352 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 810 r/min, for 29352?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29352?",
        "a": "The 260/420/95 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1910 kN / C0a 6800 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29352-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×420×95 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29452",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29452",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 3050,
    "static_load_kN": 10000,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 610,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "speed_oil_rpm": 670,
    "weight_g": 108000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "NTN 29452 belongs to the heavy-section 29400 spherical-thrust family of spherical roller thrust bearings: 260 / 480 / 132 mm (bore / OD / height). The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 52 encodes the 260 mm bore (bore code x 5). At 132 mm of height the bearing packs the heavy-section capacity into a stack far shorter than a comparable multi-row ball arrangement. Selection starts from the load case: axial must dominate, and any radial share must stay within the catalogue combined-load rule while the bearing self-aligns. On vertical shafts, confirm the minimum axial load from the rotor weight plus any spring preload before the first run at speed. ",
    "applications": [
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "At 260 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 480 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Below the minimum axial load the rollers skid; at 670 r/min the Ca of 3050 kN never comes into play before the raceway is smeared.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The Ca 3050/C0a 10000 kN ratings and 610 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29452; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29452?",
        "a": "29452 is a spherical roller thrust bearing to ISO 104: 260 mm shaft-washer bore, 480 mm outside diameter, 132 mm stack height (10.236 x 18.898 x 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 3050 kN, C0a 10000 kN and a 610 kN fatigue load limit Pu; limiting speed 670 r/min with oil lubrication; mass about 108000 g."
      },
      {
        "q": "How is the 29452 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 52 encodes the 260 mm bore (bore code x 5). The 480 mm OD and 132 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29452 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 670 r/min, for 29452?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29452?",
        "a": "The 260/480/132 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 3050 kN / C0a 10000 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29452-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×480×132 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29452"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29256-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29256",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 975,
    "static_load_kN": 4050,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 245,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1000,
    "weight_g": 19800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "NTN 29256 belongs to the light-section 29200 spherical-thrust family of spherical roller thrust bearings: 280 / 380 / 60 mm (bore / OD / height). Reading the code: 292 is the dimension series (light-section 29200 spherical-thrust family), and 56 encodes the 280 mm bore (bore code x 5). Catalogue mass is about 20 kg for the full washer-and-roller stack. If speed climbs toward the 1,000 r/min oil rating, the lubrication design — bath, circulation, cooling — becomes the real selection criterion. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat. ",
    "applications": [
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 280 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 280 mm bore it trades capacity for a smaller 380 mm OD and lower height.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29256 was chosen for.",
      "Below the minimum axial load the rollers skid; at 1,000 r/min the Ca of 975 kN never comes into play before the raceway is smeared.",
      "The 60 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 975/C0a 4050 kN ratings and 245 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29256; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29256?",
        "a": "29256 is a spherical roller thrust bearing to ISO 104: 280 mm shaft-washer bore, 380 mm outside diameter, 60 mm stack height (11.024 x 14.961 x 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 975 kN, C0a 4050 kN and a 245 kN fatigue load limit Pu; limiting speed 1,000 r/min with oil lubrication; mass about 19800 g."
      },
      {
        "q": "How is the 29256 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 56 encodes the 280 mm bore (bore code x 5). The 380 mm OD and 60 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29256 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 1,000 r/min, for 29256?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29256?",
        "a": "The 280/380/60 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 975 kN / C0a 4050 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29256",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×380×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29256",
      "29256-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29356",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29356",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 280,
    "D_mm": 440,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 2010,
    "static_load_kN": 7250,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 480,
    "limiting_speed_rpm": 790,
    "max_rpm": 790,
    "speed_oil_rpm": 790,
    "weight_g": 54600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "At 280 x 440 x 95 mm, NTN 29356 sits in the medium-section 29300 spherical-thrust family of the spherical-thrust programme. The designation is 293 is the dimension series (medium-section 29300 spherical-thrust family) plus 56 encodes the 280 mm bore (bore code x 5). Catalogue axial dynamic rating Ca is 2010 kN against C0a 7250 kN — the roller contact line is why a 280 mm bore here out-carries any thrust ball bearing of the same size. Choose the medium-section 29300 spherical-thrust family when heavy thrust meets misalignment: vertical turbines, mills and slew pivots are the classic homes. On vertical shafts, confirm the minimum axial load from the rotor weight plus any spring preload before the first run at speed. ",
    "applications": [
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "At 280 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 280 mm bore.",
      "Oil is not optional at this rating: the 790 r/min figure assumes oil lubrication, and a grease conversion is a redesign, not a fill change.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 790 r/min end of the range.",
      "Below the minimum axial load the rollers skid; at 790 r/min the Ca of 2010 kN never comes into play before the raceway is smeared.",
      "The Ca 2010/C0a 7250 kN ratings and 480 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29356; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29356?",
        "a": "29356 is a spherical roller thrust bearing to ISO 104: 280 mm shaft-washer bore, 440 mm outside diameter, 95 mm stack height (11.024 x 17.323 x 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2010 kN, C0a 7250 kN and a 480 kN fatigue load limit Pu; limiting speed 790 r/min with oil lubrication; mass about 54600 g."
      },
      {
        "q": "How is the 29356 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 56 encodes the 280 mm bore (bore code x 5). The 440 mm OD and 95 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29356 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 790 r/min, for 29356?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29356?",
        "a": "The 280/440/95 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2010 kN / C0a 7250 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29356-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×440×95 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29456",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29456",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 280,
    "D_mm": 520,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 3700,
    "static_load_kN": 12400,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 710,
    "limiting_speed_rpm": 610,
    "max_rpm": 610,
    "speed_oil_rpm": 610,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "From the heavy-section 29400 spherical-thrust family, 29456 measures 280 mm through the shaft washer, 520 mm over the outside and 145 mm in assembled height. NTN builds the number from 294 is the dimension series (heavy-section 29400 spherical-thrust family); 56 encodes the 280 mm bore (bore code x 5). Catalogue mass is about 140 kg for the full washer-and-roller stack. Within the spherical-thrust plan, 292 is the light section and 294 the heavy one; stepping up from a 292 to a 294 at the same bore roughly doubles the C0a class. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat. ",
    "applications": [
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "flaking that started where radial load share grew past the design assumption — the bearing tolerates combined load only while axial load clearly dominates",
      "cage-pocket wear after long service with vibration at standstill, the rollers hammering the pocket surfaces",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact"
    ],
    "pitfalls": [
      "At 280 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 520 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29456 was chosen for.",
      "Shock thrust above C0a 12400 kN leaves contact dents that seed fatigue; screwdown and press duties need the static check first.",
      "The 145 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 3700/C0a 12400 kN ratings and 710 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29456; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29456?",
        "a": "29456 is a spherical roller thrust bearing to ISO 104: 280 mm shaft-washer bore, 520 mm outside diameter, 145 mm stack height (11.024 x 20.472 x 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 3700 kN, C0a 12400 kN and a 710 kN fatigue load limit Pu; limiting speed 610 r/min with oil lubrication; mass about 140000 g."
      },
      {
        "q": "How is the 29456 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 56 encodes the 280 mm bore (bore code x 5). The 520 mm OD and 145 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29456 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 610 r/min, for 29456?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29456?",
        "a": "The 280/520/145 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 3700 kN / C0a 12400 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29456-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×520×145 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29456"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29260-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29260",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1330,
    "static_load_kN": 5350,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 385,
    "limiting_speed_rpm": 870,
    "max_rpm": 870,
    "speed_oil_rpm": 870,
    "weight_g": 30900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29260 is an NTN spherical roller thrust bearing of the light-section 29200 spherical-thrust family: 300 mm bore, 420 mm outside diameter, 73 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Reading the code: 292 is the dimension series (light-section 29200 spherical-thrust family), and 60 encodes the 300 mm bore (bore code x 5). The static/dynamic ratio of 4.02 tells the story of a roller raceway: enormous reserve for slow, shocked or oscillating thrust. Choose the light-section 29200 spherical-thrust family when heavy thrust meets misalignment: vertical turbines, mills and slew pivots are the classic homes. Fill the housing with the specified oil to the level that reaches the cage — these bearings are oil-bath or circulation machines, not grease machines. ",
    "applications": [
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 300 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 300 mm bore it trades capacity for a smaller 420 mm OD and lower height.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "Below the minimum axial load the rollers skid; at 870 r/min the Ca of 1330 kN never comes into play before the raceway is smeared.",
      "A spherical roller thrust bearing cannot take radial misalignment of the seats beyond its aligning travel — verify the housing geometry before blaming the bearing.",
      "The Ca 1330/C0a 5350 kN ratings and 385 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29260; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29260?",
        "a": "29260 is a spherical roller thrust bearing to ISO 104: 300 mm shaft-washer bore, 420 mm outside diameter, 73 mm stack height (11.811 x 16.535 x 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1330 kN, C0a 5350 kN and a 385 kN fatigue load limit Pu; limiting speed 870 r/min with oil lubrication; mass about 30900 g."
      },
      {
        "q": "How is the 29260 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 60 encodes the 300 mm bore (bore code x 5). The 420 mm OD and 73 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29260 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 870 r/min, for 29260?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29260?",
        "a": "The 300/420/73 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1330 kN / C0a 5350 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29260",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 300×420×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29260",
      "29260-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29360",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29360",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 300,
    "D_mm": 480,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 2380,
    "static_load_kN": 8250,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 580,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "speed_oil_rpm": 700,
    "weight_g": 75800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 29360 appears as a medium-section 29300 spherical-thrust family bearing with a 300 mm shaft washer, 480 mm across the housing washer and 109 mm of height. Reading the code: 293 is the dimension series (medium-section 29300 spherical-thrust family), and 60 encodes the 300 mm bore (bore code x 5). Catalogue mass is about 76 kg for the full washer-and-roller stack. Where the shaft also needs radial location, pair this bearing with a spherical roller or cylindrical radial bearing — the thrust bearing is not a radial guide. On vertical shafts, confirm the minimum axial load from the rotor weight plus any spring preload before the first run at speed. ",
    "applications": [
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 300 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 300 mm bore.",
      "The 109 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "Self-aligning does not mean self-locating: the housing washer must stay free on its spherical seat — clamping it flat destroys the feature the 29360 was chosen for.",
      "The 109 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 2380/C0a 8250 kN ratings and 580 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29360; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29360?",
        "a": "29360 is a spherical roller thrust bearing to ISO 104: 300 mm shaft-washer bore, 480 mm outside diameter, 109 mm stack height (11.811 x 18.898 x 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2380 kN, C0a 8250 kN and a 580 kN fatigue load limit Pu; limiting speed 700 r/min with oil lubrication; mass about 75800 g."
      },
      {
        "q": "How is the 29360 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 60 encodes the 300 mm bore (bore code x 5). The 480 mm OD and 109 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29360 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 700 r/min, for 29360?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29360?",
        "a": "The 300/480/109 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2380 kN / C0a 8250 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29360-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 300×480×109 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29360"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29460",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29460",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 3850,
    "static_load_kN": 13200,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 735,
    "limiting_speed_rpm": 590,
    "max_rpm": 590,
    "speed_oil_rpm": 590,
    "weight_g": 147000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy-section 29400 spherical-thrust family entry 29460 combines a spherical housing-washer raceway with asymmetric barrel rollers in 145 mm of stack height. The designation is 294 is the dimension series (heavy-section 29400 spherical-thrust family) plus 60 encodes the 300 mm bore (bore code x 5). At 145 mm of height the bearing packs the heavy-section capacity into a stack far shorter than a comparable multi-row ball arrangement. Minimum axial load matters here too: at speed the rollers skid on a lightly loaded bearing, so check the catalogue minimum-load formula before downsizing the thrust spring. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat. ",
    "applications": [
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "thermal distress when oil viscosity was chosen by habit instead of the operating-temperature calculation",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "At 300 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 540 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "Oil-bath level is set for the cage, not the housing: too low starves the contact, too high churns heat at the 590 r/min end of the range.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The Ca 3850/C0a 13200 kN ratings and 735 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29460; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29460?",
        "a": "29460 is a spherical roller thrust bearing to ISO 104: 300 mm shaft-washer bore, 540 mm outside diameter, 145 mm stack height (11.811 x 21.26 x 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 3850 kN, C0a 13200 kN and a 735 kN fatigue load limit Pu; limiting speed 590 r/min with oil lubrication; mass about 147000 g."
      },
      {
        "q": "How is the 29460 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 60 encodes the 300 mm bore (bore code x 5). The 540 mm OD and 145 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29460 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 590 r/min, for 29460?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29460?",
        "a": "The 300/540/145 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 3850 kN / C0a 13200 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29460-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 300×540×145 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29460"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29264-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29264",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 1400,
    "static_load_kN": 5800,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 415,
    "limiting_speed_rpm": 840,
    "max_rpm": 840,
    "speed_oil_rpm": 840,
    "weight_g": 33500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29264 is an NTN spherical roller thrust bearing of the light-section 29200 spherical-thrust family: 320 mm bore, 440 mm outside diameter, 73 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. Reading the code: 292 is the dimension series (light-section 29200 spherical-thrust family), and 64 encodes the 320 mm bore (bore code x 5). Catalogue mass is about 34 kg for the full washer-and-roller stack. Minimum axial load matters here too: at speed the rollers skid on a lightly loaded bearing, so check the catalogue minimum-load formula before downsizing the thrust spring. The 320 mm shaft washer normally mounts with a tight shaft fit; support the housing washer so it stays free to align on its spherical seat. ",
    "applications": [
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots",
      "vertical hydro and pump-turbine main thrust blocks",
      "heavy rolling-mill and forging-press thrust seats"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue",
      "fretting on the shaft seat after the washer crept under reversing axial shock"
    ],
    "pitfalls": [
      "At 320 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 292 light section is the speed-and-space end of the spherical-thrust plan — for the same 320 mm bore it trades capacity for a smaller 440 mm OD and lower height.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "Axial load must dominate; letting the radial share creep up because the radial bearing wore is the quiet path to early raceway flaking.",
      "The 73 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 1400/C0a 5800 kN ratings and 415 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29264; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29264?",
        "a": "29264 is a spherical roller thrust bearing to ISO 104: 320 mm shaft-washer bore, 440 mm outside diameter, 73 mm stack height (12.598 x 17.323 x 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 1400 kN, C0a 5800 kN and a 415 kN fatigue load limit Pu; limiting speed 840 r/min with oil lubrication; mass about 33500 g."
      },
      {
        "q": "How is the 29264 designation structured?",
        "a": "292 is the dimension series (light-section 29200 spherical-thrust family); 64 encodes the 320 mm bore (bore code x 5). The 440 mm OD and 73 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29264 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 840 r/min, for 29264?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29264?",
        "a": "The 320/440/73 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 1400 kN / C0a 5800 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29264",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×440×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29264",
      "29264-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29364",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29364",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 320,
    "D_mm": 500,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 2470,
    "static_load_kN": 8800,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 605,
    "limiting_speed_rpm": 680,
    "max_rpm": 680,
    "speed_oil_rpm": 680,
    "weight_g": 79900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29364 is the 320 mm member of NTN's medium-section 29300 spherical-thrust family: 500 mm over the housing washer, 109 mm tall. The designation is 293 is the dimension series (medium-section 29300 spherical-thrust family) plus 64 encodes the 320 mm bore (bore code x 5). Catalogue axial dynamic rating Ca is 2470 kN against C0a 8800 kN — the roller contact line is why a 320 mm bore here out-carries any thrust ball bearing of the same size. The 320/500/109 envelope follows ISO 104, so dimensional interchange holds between makers; osculation, roller profile and ratings do not automatically follow. Check face runout of the support surfaces before assembly: the self-aligning feature absorbs steady misalignment, not a rocking seat. ",
    "applications": [
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions",
      "large vertical mill and crusher main shafts",
      "heavy stacker/reclaimer and shiploading pivots"
    ],
    "failure_modes": [
      "edge stress and raceway flaking after the housing was machined so far out that the self-aligning travel ran out — alignment compensation is limited, not infinite",
      "oil-starvation polishing and then seizure of the cage guide bush when the bath level dropped below the cage",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fretting on the shaft seat after the washer crept under reversing axial shock",
      "contamination denting from wear particles circulating in the oil bath — the dents seed the next round of surface fatigue"
    ],
    "pitfalls": [
      "At 320 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 293 medium section is the workhorse: balanced height and capacity for general heavy thrust duty at 320 mm bore.",
      "Do not let the self-aligning travel absorb a bent shaft: the bearing aligns to seats, not to a shaft that whips.",
      "The C0a of 8800 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "Below the minimum axial load the rollers skid; at 680 r/min the Ca of 2470 kN never comes into play before the raceway is smeared.",
      "The Ca 2470/C0a 8800 kN ratings and 605 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29364; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29364?",
        "a": "29364 is a spherical roller thrust bearing to ISO 104: 320 mm shaft-washer bore, 500 mm outside diameter, 109 mm stack height (12.598 x 19.685 x 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 2470 kN, C0a 8800 kN and a 605 kN fatigue load limit Pu; limiting speed 680 r/min with oil lubrication; mass about 79900 g."
      },
      {
        "q": "How is the 29364 designation structured?",
        "a": "293 is the dimension series (medium-section 29300 spherical-thrust family); 64 encodes the 320 mm bore (bore code x 5). The 500 mm OD and 109 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29364 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 680 r/min, for 29364?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29364?",
        "a": "The 320/500/109 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 2470 kN / C0a 8800 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29364-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×500×109 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29364"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29464",
    "brand": "NTN",
    "manufacturer_designation": "NTN 29464",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "dynamic_load_kN": 4100,
    "static_load_kN": 14200,
    "cage_type": "brass",
    "fatigue_load_limit_kN": 820,
    "limiting_speed_rpm": 550,
    "max_rpm": 550,
    "speed_oil_rpm": 550,
    "weight_g": 181000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29464 is an NTN spherical roller thrust bearing of the heavy-section 29400 spherical-thrust family: 320 mm bore, 580 mm outside diameter, 155 mm overall height in NTN Ball and Roller Bearings CAT.No.2203E. NTN builds the number from 294 is the dimension series (heavy-section 29400 spherical-thrust family); 64 encodes the 320 mm bore (bore code x 5). Catalogue mass is about 181 kg for the full washer-and-roller stack. For oscillating or slow heavy duty, size from C0a 14200 kN with the static safety factor rather than from the life equation. Lift the bearing by the washers, never through the roller set; a 181 kg stack punishes improvisation. ",
    "applications": [
      "heavy rolling-mill and forging-press thrust seats",
      "large marine propulsion thrust supports",
      "crane and excavator main slew bearings duty",
      "rotary kiln and furnace thrust positions"
    ],
    "failure_modes": [
      "cage and roller-end scoring when the shaft was forced into alignment by the bearing itself during a bent-shaft rescue",
      "roller/raceway scuffing from an interrupted oil supply — at these loads the EHL film is the only thing between rolling and smearing",
      "roller skid smearing when axial load fell below the minimum while the shaft was still turning fast",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact",
      "fatigue spalling on the shaft-washer raceway beginning at the high-stress inner end of the roller contact"
    ],
    "pitfalls": [
      "At 320 mm bore, seating geometry, oil supply and the minimum-load guarantee decide life — field improvisation on any of the three is the usual root cause.",
      "The 294 heavy section tops the plan at this bore with the largest 580 mm OD and tallest stack — confirm housing space and oil capacity before upgrading a 293 position.",
      "The C0a of 14200 kN is a static rating — sizing continuous thrust from C0a alone overstates the raceway's life.",
      "Mixing washers between bearings during overhaul is a real risk at this size — rollers and raceways run in together, so keep each 29464 stack as a set.",
      "The 155 mm stack height is part of the load path — any spacer or shim stack added under the housing washer must carry the full thrust without settling.",
      "The Ca 4100/C0a 14200 kN ratings and 820 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 29464; roller profile and osculation legitimately differ between manufacturers, so re-verify ratings, oil supply and minimum load before substituting another make."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue ratings of NTN 29464?",
        "a": "29464 is a spherical roller thrust bearing to ISO 104: 320 mm shaft-washer bore, 580 mm outside diameter, 155 mm stack height (12.598 x 22.835 x 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: axial Ca 4100 kN, C0a 14200 kN and a 820 kN fatigue load limit Pu; limiting speed 550 r/min with oil lubrication; mass about 181000 g."
      },
      {
        "q": "How is the 29464 designation structured?",
        "a": "294 is the dimension series (heavy-section 29400 spherical-thrust family); 64 encodes the 320 mm bore (bore code x 5). The 580 mm OD and 155 mm height follow the ISO 104 boundary plan for that series."
      },
      {
        "q": "Can 29464 handle misalignment and radial load?",
        "a": "Yes to both, with limits. The spherical housing-washer raceway lets the bearing self-align against steady seat misalignment, and the angled roller contact tolerates a radial share while axial load clearly dominates. It is not a radial bearing: shaft radial location still needs its own radial bearing."
      },
      {
        "q": "Why does NTN print only an oil speed, 550 r/min, for 29464?",
        "a": "Spherical roller thrust bearings of this size work under contact stresses that need an elastohydrodynamic oil film; grease is reserved for the smallest, slowest duties. The printed figure is the limiting speed with the catalogue oil-lubrication state — bath level, viscosity and cooling decide how close a real installation may run."
      },
      {
        "q": "What should be checked before substituting another make for 29464?",
        "a": "The 320/580/155 mm envelope is ISO 104 interchangeable, but roller profile, osculation, cage and washer details are maker-specific. Re-verify Ca 4100 kN / C0a 14200 kN, the oil speed rating and the minimum-load requirement against the donor catalogue before swapping on a rated drive."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29464-E",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×580×155 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=229",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29464"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29412-E",
    "brand": "SKF",
    "manufacturer_designation": "29412 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 390,
    "static_load_kN": 915,
    "fatigue_load_limit_kN": 114,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 2600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29412 E is the classic hook-block and screw-end thrust bearing: 60 mm shaft washer bore, 130 mm OD, minimum axial load factor A 0.08, and free rotation under load thanks to the spherical geometry. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29412 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. The 2600 g mass and 42 mm axial height sit between 60 and 130 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 0.08) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 60 mm bore the 294 bearing already weighs 2.6 kg and sits 42 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29412 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 0.08 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 390/915 kN ratings and 2600 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29412 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29412 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.08 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 5,000 r/min."
      },
      {
        "q": "Which dimensions does the 29412 E have?",
        "a": "A 29412 E measures 60 mm bore × 130 mm outside diameter × 42 mm width (2.362 × 5.118 × 1.654 in). From SKF catalogue PUB BU/P1 17000: dynamic C 390 kN, static C0 915 kN, fatigue limit Pu 114 kN, reference speed 2,800 r/min, limiting speed 5,000 r/min, mass about 2600 g. Minimum axial load factor A 0.08 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29412",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29412",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29412-E",
      "29412 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29413-E",
    "brand": "SKF",
    "manufacturer_designation": "29413 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 455,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 137,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 3200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29413 E for very heavy one-direction axial load: 455 kN dynamic and 1080 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. The designation 29413 E separates into 294 (series), 13 (65 mm bore) and E; washers are separable for individual mounting. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Minimum axial load is explicit at factor A 0.11: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 0.11) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 65 mm bore the 294 bearing already weighs 3.2 kg and sits 45 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "the 2,600 r/min reference speed is the thermal criterion under load, the 4,800 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29413 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 0.11 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 455/1080 kN ratings and 3200 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 0.11) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.11 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29413 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29413 E mounted?",
        "a": "Tight shaft washer on the 65 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.11 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29413 E?",
        "a": "A 29413 E measures 65 mm bore × 140 mm outside diameter × 45 mm width (2.559 × 5.512 × 1.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 455 kN, static C0 1080 kN, fatigue limit Pu 137 kN, reference speed 2,600 r/min, limiting speed 4,800 r/min, mass about 3200 g. Minimum axial load factor A 0.11 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29413",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29413",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29413-E",
      "29413 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29414-E",
    "brand": "SKF",
    "manufacturer_designation": "29414 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 520,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 153,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29414 E is the classic hook-block and screw-end thrust bearing: 70 mm shaft washer bore, 150 mm OD, minimum axial load factor A 0.15, and free rotation under load thanks to the spherical geometry. In 29414 E, the 294 series fixes the 150 mm OD and 48 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 14 selects the 70 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Selection arithmetic: C 520 kN against C0 1250 kN gives a C0/C ratio of 2.40 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Verify the minimum axial load (factor A 0.15) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 70 mm bore the 294 bearing already weighs 3.9 kg and sits 48 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Minimum load factor A 0.15 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29414 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 520/1250 kN ratings and 3900 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 0.15) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.15 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29414 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29414 E mounted?",
        "a": "Tight shaft washer on the 70 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.15 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29414 E?",
        "a": "A 29414 E measures 70 mm bore × 150 mm outside diameter × 48 mm width (2.756 × 5.906 × 1.89 in). From SKF catalogue PUB BU/P1 17000: dynamic C 520 kN, static C0 1250 kN, fatigue limit Pu 153 kN, reference speed 2,400 r/min, limiting speed 4,300 r/min, mass about 3900 g. Minimum axial load factor A 0.15 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29414",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29414",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29414-E",
      "29414 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29415-E",
    "brand": "SKF",
    "manufacturer_designation": "29415 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 600,
    "static_load_kN": 1430,
    "fatigue_load_limit_kN": 173,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 4700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29415 E is a spherical roller thrust bearing to ISO 104 in the heavy 294 series: asymmetrical barrel rollers running on a sphered housing washer, sized 75×160×51 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29415 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 29415 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 75 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 600 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 75 mm bore the 294 bearing already weighs 4.7 kg and sits 51 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "The 600/1430 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.19 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29415 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 600/1430 kN ratings and 4700 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29415 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29415 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.19 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 4,000 r/min."
      },
      {
        "q": "Which dimensions does the 29415 E have?",
        "a": "A 29415 E measures 75 mm bore × 160 mm outside diameter × 51 mm width (2.953 × 6.299 × 2.008 in). From SKF catalogue PUB BU/P1 17000: dynamic C 600 kN, static C0 1430 kN, fatigue limit Pu 173 kN, reference speed 2,400 r/min, limiting speed 4,000 r/min, mass about 4700 g. Minimum axial load factor A 0.19 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29415",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29415",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29415-E",
      "29415 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29416-E",
    "brand": "SKF",
    "manufacturer_designation": "29416 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 54,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 670,
    "static_load_kN": 1630,
    "fatigue_load_limit_kN": 193,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 5600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29416 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 54 mm of axial section. The designation 29416 E separates into 294 (series), 16 (80 mm bore) and E; washers are separable for individual mounting. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 29416 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 80 mm bore the 294 bearing already weighs 5.6 kg and sits 54 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 670/1630 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.25 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 670/1630 kN ratings and 5600 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29416 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29416 E mounted?",
        "a": "Tight shaft washer on the 80 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.25 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29416 E?",
        "a": "A 29416 E measures 80 mm bore × 170 mm outside diameter × 54 mm width (3.15 × 6.693 × 2.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 670 kN, static C0 1630 kN, fatigue limit Pu 193 kN, reference speed 2,200 r/min, limiting speed 3,800 r/min, mass about 5600 g. Minimum axial load factor A 0.25 must be maintained in service."
      },
      {
        "q": "How is the 29416 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 16 the 80 mm bore (code 16 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29416",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29416",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29416-E",
      "29416 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29317-E",
    "brand": "SKF",
    "manufacturer_designation": "29317 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 129,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 2750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The medium 293 series bearing 29317 E carries 380 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 85 mm shafts. In 29317 E, the 293 series fixes the 150 mm OD and 39 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 17 selects the 85 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Selection arithmetic: C 380 kN against C0 1060 kN gives a C0/C ratio of 2.79 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: fit the shaft washer tight on the 85 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 380 kN working load.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 85 mm bore the 293 bearing already weighs 2.8 kg and sits 39 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 380/1060 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.11 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 380/1060 kN ratings and 2750 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 0.11) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.11 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29317 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29317 E mounted?",
        "a": "Tight shaft washer on the 85 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.11 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29317 E?",
        "a": "A 29317 E measures 85 mm bore × 150 mm outside diameter × 39 mm width (3.346 × 5.906 × 1.535 in). From SKF catalogue PUB BU/P1 17000: dynamic C 380 kN, static C0 1060 kN, fatigue limit Pu 129 kN, reference speed 2,400 r/min, limiting speed 4,000 r/min, mass about 2750 g. Minimum axial load factor A 0.11 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29317",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29317",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29317-E",
      "29317 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29417-E",
    "brand": "SKF",
    "manufacturer_designation": "29417 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 1800,
    "fatigue_load_limit_kN": 212,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 6750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29417 E is a spherical roller thrust bearing to ISO 104 in the heavy 294 series: asymmetrical barrel rollers running on a sphered housing washer, sized 85×180×58 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. Reading the code: 294 gives the dimension series (heavy 294 series) and 17 the 85 mm shaft washer bore (code 17 × 5); the E sets the cage design. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Static safety matters for shock duty: compare peak axial force against C0 1800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 85 mm bore the 294 bearing already weighs 6.8 kg and sits 58 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29417 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 735/1800 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.31 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 735/1800 kN ratings and 6750 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29417 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.31 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 3,600 r/min."
      },
      {
        "q": "Which dimensions does the 29417 E have?",
        "a": "A 29417 E measures 85 mm bore × 180 mm outside diameter × 58 mm width (3.346 × 7.087 × 2.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 735 kN, static C0 1800 kN, fatigue limit Pu 212 kN, reference speed 2,000 r/min, limiting speed 3,600 r/min, mass about 6750 g. Minimum axial load factor A 0.31 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29417 E is the heavy 294 series, 85×180×58 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29417",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29417",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29417-E",
      "29417 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29318-E",
    "brand": "SKF",
    "manufacturer_designation": "29318 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 90,
    "D_mm": 155,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 400,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 132,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 2850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29318 E aligns itself: 90×155×39 mm envelope, 1080 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29318 E is the stamped steel E window cage. A minimum axial load of factor A 0.11 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. One direction only: 29318 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 90 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 400 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 90 mm bore the 293 bearing already weighs 2.9 kg and sits 39 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29318 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 400/1080 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.11 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 400/1080 kN ratings and 2850 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29318 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29318 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.11 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 4,000 r/min."
      },
      {
        "q": "Which dimensions does the 29318 E have?",
        "a": "A 29318 E measures 90 mm bore × 155 mm outside diameter × 39 mm width (3.543 × 6.102 × 1.535 in). From SKF catalogue PUB BU/P1 17000: dynamic C 400 kN, static C0 1080 kN, fatigue limit Pu 132 kN, reference speed 2,400 r/min, limiting speed 4,000 r/min, mass about 2850 g. Minimum axial load factor A 0.11 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29318",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×155×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29318",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29318-E",
      "29318 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29418-E",
    "brand": "SKF",
    "manufacturer_designation": "29418 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 815,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 232,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 7750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29418 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 60 mm of axial section. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29418 E is the stamped steel E window cage. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Minimum axial load is explicit at factor A 0.38: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 90 mm bore the 294 bearing already weighs 7.8 kg and sits 60 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,900 r/min reference speed is the thermal criterion under load, the 3,400 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 815/2000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 815/2000 kN ratings and 7750 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29418 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.38 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 3,400 r/min."
      },
      {
        "q": "Which dimensions does the 29418 E have?",
        "a": "A 29418 E measures 90 mm bore × 190 mm outside diameter × 60 mm width (3.543 × 7.48 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 815 kN, static C0 2000 kN, fatigue limit Pu 232 kN, reference speed 1,900 r/min, limiting speed 3,400 r/min, mass about 7750 g. Minimum axial load factor A 0.38 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29418 E is the heavy 294 series, 90×190×60 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29418",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29418",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29418-E",
      "29418 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29320-E",
    "brand": "SKF",
    "manufacturer_designation": "29320 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 100,
    "D_mm": 170,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 465,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 156,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 3650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29320 E aligns itself: 100×170×42 mm envelope, 1290 kN static rating, one load direction. In 29320 E, the 293 series fixes the 170 mm OD and 42 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 20 selects the 100 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Speed planning separates the 2,200 r/min thermal reference from the 3,600 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: fit the shaft washer tight on the 100 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 465 kN working load.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 100 mm bore the 293 bearing already weighs 3.6 kg and sits 42 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "the 2,200 r/min reference speed is the thermal criterion under load, the 3,600 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29320 E.",
      "Minimum load factor A 0.16 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 465/1290 kN ratings and 3650 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29320 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 20 the 100 mm bore (code 20 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 0.16) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.16 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29320 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29320 E mounted?",
        "a": "Tight shaft washer on the 100 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.16 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29320",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×170×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29320",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29320-E",
      "29320 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29420-E",
    "brand": "SKF",
    "manufacturer_designation": "29420 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 100,
    "D_mm": 210,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 980,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 275,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29420 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 67 mm of axial section. Reading the code: 294 gives the dimension series (heavy 294 series) and 20 the 100 mm shaft washer bore (code 20 × 5); the E sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 2500 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 100 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 980 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 100 mm bore the 294 bearing already weighs 10.5 kg and sits 67 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,700 r/min reference speed is the thermal criterion under load, the 3,000 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 0.59 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29420 E.",
      "The 980/2500 kN ratings and 10500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29420 E is the heavy 294 series, 100×210×67 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29420 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29420 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.59 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 3,000 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29420",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×210×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29420",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29420-E",
      "29420 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29322-E",
    "brand": "SKF",
    "manufacturer_designation": "29322 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 110,
    "D_mm": 190,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 610,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 204,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "weight_g": 5300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29322 E aligns itself: 110×190×48 mm envelope, 1730 kN static rating, one load direction. The designation 29322 E separates into 293 (series), 22 (110 mm bore) and E; washers are separable for individual mounting. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 29322 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 110 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 610 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 110 mm bore the 293 bearing already weighs 5.3 kg and sits 48 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Minimum load factor A 0.28 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,900 r/min reference speed is the thermal criterion under load, the 3,200 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29322 E.",
      "The 610/1730 kN ratings and 5300 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29322 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 22 the 110 mm bore (code 22 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 0.28) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.28 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29322 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29322 E mounted?",
        "a": "Tight shaft washer on the 110 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.28 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29322",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×190×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29322",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29322-E",
      "29322 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29422-E",
    "brand": "SKF",
    "manufacturer_designation": "29422 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 110,
    "D_mm": 230,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1180,
    "static_load_kN": 3000,
    "fatigue_load_limit_kN": 325,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29422 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 73 mm of axial section. The designation 29422 E separates into 294 (series), 22 (110 mm bore) and E; washers are separable for individual mounting. A minimum axial load of factor A 0.86 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Minimum axial load is explicit at factor A 0.86: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 110 mm bore the 294 bearing already weighs 13.5 kg and sits 73 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1180/3000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,600 r/min reference speed is the thermal criterion under load, the 2,800 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 1180/3000 kN ratings and 13500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 0.86) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.86 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29422 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29422 E mounted?",
        "a": "Tight shaft washer on the 110 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.86 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29422 E?",
        "a": "A 29422 E measures 110 mm bore × 230 mm outside diameter × 73 mm width (4.331 × 9.055 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1180 kN, static C0 3000 kN, fatigue limit Pu 325 kN, reference speed 1,600 r/min, limiting speed 2,800 r/min, mass about 13500 g. Minimum axial load factor A 0.86 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29422",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×230×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29422",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29422-E",
      "29422 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29324-E",
    "brand": "SKF",
    "manufacturer_designation": "29324 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 120,
    "D_mm": 210,
    "B_mm": 54,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 765,
    "static_load_kN": 2120,
    "fatigue_load_limit_kN": 245,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 7350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29324 E aligns itself: 120×210×54 mm envelope, 2120 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29324 E is the stamped steel E window cage. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Minimum axial load is explicit at factor A 0.43: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: fit the shaft washer tight on the 120 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 765 kN working load.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 120 mm bore the 293 bearing already weighs 7.3 kg and sits 54 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29324 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "the 1,700 r/min reference speed is the thermal criterion under load, the 2,800 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 0.43 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 765/2120 kN ratings and 7350 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29324 E is the medium 293 series, 120×210×54 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29324 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29324 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.43 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,800 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29324",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×210×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29324",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29324-E",
      "29324 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29424-E",
    "brand": "SKF",
    "manufacturer_designation": "29424 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 120,
    "D_mm": 250,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1370,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 375,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 17500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29424 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 78 mm of axial section. In 29424 E, the 294 series fixes the 250 mm OD and 78 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 24 selects the 120 mm seat. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Selection arithmetic: C 1370 kN against C0 3450 kN gives a C0/C ratio of 2.52 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 120 mm bore the 294 bearing already weighs 17.5 kg and sits 78 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "the 1,500 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29424 E.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "Minimum load factor A 1.1 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 1370/3450 kN ratings and 17500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 1.1) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 1.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29424 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29424 E mounted?",
        "a": "Tight shaft washer on the 120 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 1.1 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29424 E?",
        "a": "A 29424 E measures 120 mm bore × 250 mm outside diameter × 78 mm width (4.724 × 9.843 × 3.071 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1370 kN, static C0 3450 kN, fatigue limit Pu 375 kN, reference speed 1,500 r/min, limiting speed 2,600 r/min, mass about 17500 g. Minimum axial load factor A 1.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29424",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×250×78 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29424",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29424-E",
      "29424 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29326-E",
    "brand": "SKF",
    "manufacturer_designation": "29326 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 130,
    "D_mm": 225,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 865,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 280,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 9000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29326 E aligns itself: 130×225×58 mm envelope, 2500 kN static rating, one load direction. Reading the code: 293 gives the dimension series (medium 293 series) and 26 the 130 mm shaft washer bore (code 26 × 5); the E sets the cage design. A minimum axial load of factor A 0.59 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Speed planning separates the 1,600 r/min thermal reference from the 2,600 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 130 mm bore, oil flow becomes the design variable: the 865 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,600 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29326 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 865/2500 kN ratings and 9000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29326 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29326 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.59 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,600 r/min."
      },
      {
        "q": "Which dimensions does the 29326 E have?",
        "a": "A 29326 E measures 130 mm bore × 225 mm outside diameter × 58 mm width (5.118 × 8.858 × 2.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 865 kN, static C0 2500 kN, fatigue limit Pu 280 kN, reference speed 1,600 r/min, limiting speed 2,600 r/min, mass about 9000 g. Minimum axial load factor A 0.59 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29326",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×225×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29326",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29326-E",
      "29326 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29426-E",
    "brand": "SKF",
    "manufacturer_designation": "29426 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 130,
    "D_mm": 270,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 4050,
    "fatigue_load_limit_kN": 430,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 22000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29426 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 85 mm of axial section. Reading the code: 294 gives the dimension series (heavy 294 series) and 26 the 130 mm shaft washer bore (code 26 × 5); the E sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 4050 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 1.6) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 130 mm bore, oil flow becomes the design variable: the 1560 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 1560/4050 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1.6 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,400 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29426 E.",
      "The 1560/4050 kN ratings and 22000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29426 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.6 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,400 r/min."
      },
      {
        "q": "Which dimensions does the 29426 E have?",
        "a": "A 29426 E measures 130 mm bore × 270 mm outside diameter × 85 mm width (5.118 × 10.63 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1560 kN, static C0 4050 kN, fatigue limit Pu 430 kN, reference speed 1,300 r/min, limiting speed 2,400 r/min, mass about 22000 g. Minimum axial load factor A 1.6 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29426 E is the heavy 294 series, 130×270×85 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29426",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×270×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29426",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29426-E",
      "29426 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29328-E",
    "brand": "SKF",
    "manufacturer_designation": "29328 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 140,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 980,
    "static_load_kN": 2850,
    "fatigue_load_limit_kN": 315,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29328 E is the classic hook-block and screw-end thrust bearing: 140 mm shaft washer bore, 240 mm OD, minimum axial load factor A 0.77, and free rotation under load thanks to the spherical geometry. The designation 29328 E separates into 293 (series), 28 (140 mm bore) and E; washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 2850 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 0.77) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 140 mm bore, oil flow becomes the design variable: the 980 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 980/2850 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29328 E.",
      "Minimum load factor A 0.77 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 980/2850 kN ratings and 10500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 0.77) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.77 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29328 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29328 E mounted?",
        "a": "Tight shaft washer on the 140 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.77 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29328 E?",
        "a": "A 29328 E measures 140 mm bore × 240 mm outside diameter × 60 mm width (5.512 × 9.449 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 980 kN, static C0 2850 kN, fatigue limit Pu 315 kN, reference speed 1,500 r/min, limiting speed 2,600 r/min, mass about 10500 g. Minimum axial load factor A 0.77 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29328",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×240×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29328",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29328-E",
      "29328 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29428-E",
    "brand": "SKF",
    "manufacturer_designation": "29428 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 140,
    "D_mm": 280,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1630,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 455,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 23000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29428 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 85 mm of axial section. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29428 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Minimum axial load is explicit at factor A 1.8: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 1.8) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 140 mm bore, oil flow becomes the design variable: the 1630 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29428 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,400 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 1.8 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 1630/4300 kN ratings and 23000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29428 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.8 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,400 r/min."
      },
      {
        "q": "Which dimensions does the 29428 E have?",
        "a": "A 29428 E measures 140 mm bore × 280 mm outside diameter × 85 mm width (5.512 × 11.024 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1630 kN, static C0 4300 kN, fatigue limit Pu 455 kN, reference speed 1,300 r/min, limiting speed 2,400 r/min, mass about 23000 g. Minimum axial load factor A 1.8 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29428 E is the heavy 294 series, 140×280×85 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29428",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×280×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29428",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29428-E",
      "29428 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29230-E",
    "brand": "SKF",
    "manufacturer_designation": "29230 E",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 150,
    "D_mm": 215,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 408,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 180,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 4300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29230 E for very heavy one-direction axial load: 408 kN dynamic and 1600 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29230 E is the stamped steel E window cage. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Minimum axial load is explicit at factor A 0.24: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 0.24) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 150 mm bore, oil flow becomes the design variable: the 408 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 408/1600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.24 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,800 r/min reference speed is the thermal criterion under load, the 2,800 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "The 408/1600 kN ratings and 4300 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.24 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,800 r/min."
      },
      {
        "q": "Which dimensions does the 29230 E have?",
        "a": "A 29230 E measures 150 mm bore × 215 mm outside diameter × 39 mm width (5.906 × 8.465 × 1.535 in). From SKF catalogue PUB BU/P1 17000: dynamic C 408 kN, static C0 1600 kN, fatigue limit Pu 180 kN, reference speed 1,800 r/min, limiting speed 2,800 r/min, mass about 4300 g. Minimum axial load factor A 0.24 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29230 E is the high-speed 292 series, 150×215×39 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29230 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29230",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×215×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29230",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29230-E",
      "29230 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29330-E",
    "brand": "SKF",
    "manufacturer_designation": "29330 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 2850,
    "fatigue_load_limit_kN": 315,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29330 E aligns itself: 150×250×60 mm envelope, 2850 kN static rating, one load direction. In 29330 E, the 293 series fixes the 250 mm OD and 60 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 30 selects the 150 mm seat. The medium 293 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Selection arithmetic: C 1000 kN against C0 2850 kN gives a C0/C ratio of 2.85 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: fit the shaft washer tight on the 150 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 1000 kN working load.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 150 mm bore, oil flow becomes the design variable: the 1000 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1000/2850 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.77 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 1000/2850 kN ratings and 11000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29330 E?",
        "a": "A 29330 E measures 150 mm bore × 250 mm outside diameter × 60 mm width (5.906 × 9.843 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1000 kN, static C0 2850 kN, fatigue limit Pu 315 kN, reference speed 1,500 r/min, limiting speed 2,400 r/min, mass about 11000 g. Minimum axial load factor A 0.77 must be maintained in service."
      },
      {
        "q": "How is the 29330 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 30 the 150 mm bore (code 30 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 0.77) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.77 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29330 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29330",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×250×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29330",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29330-E",
      "29330 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29430-E",
    "brand": "SKF",
    "manufacturer_designation": "29430 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 150,
    "D_mm": 300,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1860,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 520,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 28000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29430 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 90 mm of axial section. In 29430 E, the 294 series fixes the 300 mm OD and 90 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 30 selects the 150 mm seat. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. The 28000 g mass and 90 mm axial height sit between 150 and 300 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 150 mm bore, oil flow becomes the design variable: the 1860 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "the 1,200 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29430 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1860/5100 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 1860/5100 kN ratings and 28000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29430 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 30 the 150 mm bore (code 30 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 2.5) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 2.5 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29430 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29430 E mounted?",
        "a": "Tight shaft washer on the 150 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 2.5 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29430",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×300×90 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29430",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29430-E",
      "29430 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29332-E",
    "brand": "SKF",
    "manufacturer_designation": "29332 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1180,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 375,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29332 E aligns itself: 160×270×67 mm envelope, 3450 kN static rating, one load direction. Reading the code: 293 gives the dimension series (medium 293 series) and 32 the 160 mm shaft washer bore (code 32 × 5); the E sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 3450 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 160 mm bore, oil flow becomes the design variable: the 1180 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 1.1 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29332 E.",
      "The 1180/3450 kN ratings and 14500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29332 E is the medium 293 series, 160×270×67 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29332 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29332 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.1 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,200 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29332",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×270×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29332-E",
      "29332 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29432-E",
    "brand": "SKF",
    "manufacturer_designation": "29432 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 160,
    "D_mm": 320,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2080,
    "static_load_kN": 5600,
    "fatigue_load_limit_kN": 570,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 32000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29432 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 95 mm of axial section. The designation 29432 E separates into 294 (series), 32 (160 mm bore) and E; washers are separable for individual mounting. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Minimum axial load is explicit at factor A 3: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 3) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 160 mm bore, oil flow becomes the design variable: the 2080 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Minimum load factor A 3 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 2080/5600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "the 1,100 r/min reference speed is the thermal criterion under load, the 2,000 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 2080/5600 kN ratings and 32000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 3) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 3 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29432 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29432 E mounted?",
        "a": "Tight shaft washer on the 160 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 3 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29432 E?",
        "a": "A 29432 E measures 160 mm bore × 320 mm outside diameter × 95 mm width (6.299 × 12.598 × 3.74 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2080 kN, static C0 5600 kN, fatigue limit Pu 570 kN, reference speed 1,100 r/min, limiting speed 2,000 r/min, mass about 32000 g. Minimum axial load factor A 3 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29432",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×320×95 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29432",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29432-E",
      "29432 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29334-E",
    "brand": "SKF",
    "manufacturer_designation": "29334 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1200,
    "static_load_kN": 3550,
    "fatigue_load_limit_kN": 365,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 15000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29334 E is the classic hook-block and screw-end thrust bearing: 170 mm shaft washer bore, 280 mm OD, minimum axial load factor A 1.2, and free rotation under load thanks to the spherical geometry. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29334 E is the stamped steel E window cage. The medium 293 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Minimum axial load is explicit at factor A 1.2: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 1.2) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 170 mm bore, oil flow becomes the design variable: the 1200 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 1200/3550 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1.2 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 1200/3550 kN ratings and 15000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29334 E is the medium 293 series, 170×280×67 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29334 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29334 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.2 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,200 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29334",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×280×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29334-E",
      "29334 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29434-E",
    "brand": "SKF",
    "manufacturer_designation": "29434 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 170,
    "D_mm": 340,
    "B_mm": 103,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2360,
    "static_load_kN": 6550,
    "fatigue_load_limit_kN": 640,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "weight_g": 44500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29434 E carries 2360 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 170 mm shafts. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29434 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 29434 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 170 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 2360 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 170 mm bore, oil flow becomes the design variable: the 2360 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29434 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2360/6550 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 4.1 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 2360/6550 kN ratings and 44500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29434 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29434 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 4.1 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,900 r/min."
      },
      {
        "q": "Which dimensions does the 29434 E have?",
        "a": "A 29434 E measures 170 mm bore × 340 mm outside diameter × 103 mm width (6.693 × 13.386 × 4.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2360 kN, static C0 6550 kN, fatigue limit Pu 640 kN, reference speed 1,100 r/min, limiting speed 1,900 r/min, mass about 44500 g. Minimum axial load factor A 4.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29434",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×340×103 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29434",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29434-E",
      "29434 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29236-E",
    "brand": "SKF",
    "manufacturer_designation": "29236 E",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 495,
    "static_load_kN": 2040,
    "fatigue_load_limit_kN": 212,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 5800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29236 E is a spherical roller thrust bearing to ISO 104 in the high-speed 292 series: asymmetrical barrel rollers running on a sphered housing washer, sized 180×250×42 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. In 29236 E, the 292 series fixes the 250 mm OD and 42 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 36 selects the 180 mm seat. A minimum axial load of factor A 0.4 must be maintained — in the large 292 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 5800 g mass and 42 mm axial height sit between 180 and 250 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 0.4) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 180 mm bore, oil flow becomes the design variable: the 495 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 495/2040 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "the 1,600 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29236 E.",
      "The 495/2040 kN ratings and 5800 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29236 E designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 36 the 180 mm bore (code 36 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 0.4) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.4 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29236 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29236 E mounted?",
        "a": "Tight shaft washer on the 180 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.4 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29236",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "29236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29236-E",
      "29236 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29336-E",
    "brand": "SKF",
    "manufacturer_designation": "29336 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1430,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 440,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 19500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29336 E is the classic hook-block and screw-end thrust bearing: 180 mm shaft washer bore, 300 mm OD, minimum axial load factor A 1.8, and free rotation under load thanks to the spherical geometry. In 29336 E, the 293 series fixes the 300 mm OD and 73 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 36 selects the 180 mm seat. A minimum axial load of factor A 1.8 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. One direction only: 29336 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Verify the minimum axial load (factor A 1.8) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 180 mm bore, oil flow becomes the design variable: the 1430 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "the 1,200 r/min reference speed is the thermal criterion under load, the 2,000 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29336 E.",
      "Minimum load factor A 1.8 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 1430/4300 kN ratings and 19500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29336 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 36 the 180 mm bore (code 36 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 1.8) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 1.8 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29336 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29336 E mounted?",
        "a": "Tight shaft washer on the 180 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 1.8 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29336",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×300×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29336-E",
      "29336 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29436-E",
    "brand": "SKF",
    "manufacturer_designation": "29436 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 180,
    "D_mm": 360,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2600,
    "static_load_kN": 7350,
    "fatigue_load_limit_kN": 710,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 52500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29436 E carries 2600 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 180 mm shafts. Reading the code: 294 gives the dimension series (heavy 294 series) and 36 the 180 mm shaft washer bore (code 36 × 5); the E sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. The 52500 g mass and 109 mm axial height sit between 180 and 360 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 180 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 2600 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 180 mm bore, oil flow becomes the design variable: the 2600 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,000 r/min reference speed is the thermal criterion under load, the 1,800 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 2600/7350 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 5.1 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 2600/7350 kN ratings and 52500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29436 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29436 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 5.1 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,800 r/min."
      },
      {
        "q": "Which dimensions does the 29436 E have?",
        "a": "A 29436 E measures 180 mm bore × 360 mm outside diameter × 109 mm width (7.087 × 14.173 × 4.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2600 kN, static C0 7350 kN, fatigue limit Pu 710 kN, reference speed 1,000 r/min, limiting speed 1,800 r/min, mass about 52500 g. Minimum axial load factor A 5.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29436",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×360×109 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29436",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29436-E",
      "29436 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29338-E",
    "brand": "SKF",
    "manufacturer_designation": "29338 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1630,
    "static_load_kN": 4750,
    "fatigue_load_limit_kN": 490,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "weight_g": 23500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29338 E is the classic hook-block and screw-end thrust bearing: 190 mm shaft washer bore, 320 mm OD, minimum axial load factor A 2.1, and free rotation under load thanks to the spherical geometry. The designation 29338 E separates into 293 (series), 38 (190 mm bore) and E; washers are separable for individual mounting. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 4750 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 190 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 1630 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 190 mm bore, oil flow becomes the design variable: the 1630 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Minimum load factor A 2.1 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,100 r/min reference speed is the thermal criterion under load, the 1,900 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29338 E.",
      "The 1630/4750 kN ratings and 23500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 2.1) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 2.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29338 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29338 E mounted?",
        "a": "Tight shaft washer on the 190 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 2.1 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29338 E?",
        "a": "A 29338 E measures 190 mm bore × 320 mm outside diameter × 78 mm width (7.48 × 12.598 × 3.071 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1630 kN, static C0 4750 kN, fatigue limit Pu 490 kN, reference speed 1,100 r/min, limiting speed 1,900 r/min, mass about 23500 g. Minimum axial load factor A 2.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29338",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×320×78 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29338-E",
      "29338 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29438-E",
    "brand": "SKF",
    "manufacturer_designation": "29438 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 190,
    "D_mm": 380,
    "B_mm": 115,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2850,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 765,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 60500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29438 E carries 2850 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 190 mm shafts. The designation 29438 E separates into 294 (series), 38 (190 mm bore) and E; washers are separable for individual mounting. A minimum axial load of factor A 6.1 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Speed planning separates the 950 r/min thermal reference from the 1,700 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 190 mm bore, oil flow becomes the design variable: the 2850 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2850/8000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 6.1 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 2850/8000 kN ratings and 60500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29438 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29438 E mounted?",
        "a": "Tight shaft washer on the 190 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 6.1 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29438 E?",
        "a": "A 29438 E measures 190 mm bore × 380 mm outside diameter × 115 mm width (7.48 × 14.961 × 4.528 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2850 kN, static C0 8000 kN, fatigue limit Pu 765 kN, reference speed 950 r/min, limiting speed 1,700 r/min, mass about 60500 g. Minimum axial load factor A 6.1 must be maintained in service."
      },
      {
        "q": "How is the 29438 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 38 the 190 mm bore (code 38 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29438",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×380×115 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29438",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29438-E",
      "29438 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29240-E",
    "brand": "SKF",
    "manufacturer_designation": "29240 E",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 656,
    "static_load_kN": 2650,
    "fatigue_load_limit_kN": 285,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 9300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29240 E is a spherical roller thrust bearing to ISO 104 in the high-speed 292 series: asymmetrical barrel rollers running on a sphered housing washer, sized 200×280×48 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29240 E is the stamped steel E window cage. The high-speed 292 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Minimum axial load is explicit at factor A 0.67: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 200 mm bore, oil flow becomes the design variable: the 656 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,400 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 656/2650 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 656/2650 kN ratings and 9300 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.67 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,200 r/min."
      },
      {
        "q": "Which dimensions does the 29240 E have?",
        "a": "A 29240 E measures 200 mm bore × 280 mm outside diameter × 48 mm width (7.874 × 11.024 × 1.89 in). From SKF catalogue PUB BU/P1 17000: dynamic C 656 kN, static C0 2650 kN, fatigue limit Pu 285 kN, reference speed 1,400 r/min, limiting speed 2,200 r/min, mass about 9300 g. Minimum axial load factor A 0.67 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29240 E is the high-speed 292 series, 200×280×48 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29240 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29240",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×280×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29240-E",
      "29240 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29340-E",
    "brand": "SKF",
    "manufacturer_designation": "29340 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1860,
    "static_load_kN": 5500,
    "fatigue_load_limit_kN": 550,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 28500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29340 E is the classic hook-block and screw-end thrust bearing: 200 mm shaft washer bore, 340 mm OD, minimum axial load factor A 2.9, and free rotation under load thanks to the spherical geometry. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29340 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 29340 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Verify the minimum axial load (factor A 2.9) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 200 mm bore, oil flow becomes the design variable: the 1860 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 1860/5500 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 2.9 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29340 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1860/5500 kN ratings and 28500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 29340 E have?",
        "a": "A 29340 E measures 200 mm bore × 340 mm outside diameter × 85 mm width (7.874 × 13.386 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1860 kN, static C0 5500 kN, fatigue limit Pu 550 kN, reference speed 1,000 r/min, limiting speed 1,700 r/min, mass about 28500 g. Minimum axial load factor A 2.9 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29340 E is the medium 293 series, 200×340×85 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29340 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29340 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29340",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×340×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29340-E",
      "29340 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29440-E",
    "brand": "SKF",
    "manufacturer_designation": "29440 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 200,
    "D_mm": 400,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3200,
    "static_load_kN": 9000,
    "fatigue_load_limit_kN": 850,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "weight_g": 72000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29440 E carries 3200 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 200 mm shafts. In 29440 E, the 294 series fixes the 400 mm OD and 122 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 40 selects the 200 mm seat. A minimum axial load of factor A 7.7 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 72000 g mass and 122 mm axial height sit between 200 and 400 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 200 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3200 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 200 mm bore, oil flow becomes the design variable: the 3200 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 3200/9000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "the 850 r/min reference speed is the thermal criterion under load, the 1,600 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29440 E.",
      "The 3200/9000 kN ratings and 72000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29440 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 40 the 200 mm bore (code 40 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 7.7) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 7.7 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29440 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29440 E mounted?",
        "a": "Tight shaft washer on the 200 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 7.7 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29440",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×400×122 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29440",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29440-E",
      "29440 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29244-E",
    "brand": "SKF",
    "manufacturer_designation": "29244 E",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 3000,
    "fatigue_load_limit_kN": 310,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29244 E is a spherical roller thrust bearing to ISO 104 in the high-speed 292 series: asymmetrical barrel rollers running on a sphered housing washer, sized 220×300×48 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. The designation 29244 E separates into 292 (series), 44 (220 mm bore) and E; washers are separable for individual mounting. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 3000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 0.86) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 220 mm bore, oil flow becomes the design variable: the 690 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29244 E.",
      "The 690/3000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.86 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 690/3000 kN ratings and 10000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29244 E?",
        "a": "A 29244 E measures 220 mm bore × 300 mm outside diameter × 48 mm width (8.661 × 11.811 × 1.89 in). From SKF catalogue PUB BU/P1 17000: dynamic C 690 kN, static C0 3000 kN, fatigue limit Pu 310 kN, reference speed 1,300 r/min, limiting speed 2,200 r/min, mass about 10000 g. Minimum axial load factor A 0.86 must be maintained in service."
      },
      {
        "q": "How is the 29244 E designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 44 the 220 mm bore (code 44 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 0.86) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.86 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29244 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29244",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×300×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29244-E",
      "29244 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29344-E",
    "brand": "SKF",
    "manufacturer_designation": "29344 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 220,
    "D_mm": 360,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2000,
    "static_load_kN": 6300,
    "fatigue_load_limit_kN": 610,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 31000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29344 E is the classic hook-block and screw-end thrust bearing: 220 mm shaft washer bore, 360 mm OD, minimum axial load factor A 3.8, and free rotation under load thanks to the spherical geometry. The designation 29344 E separates into 293 (series), 44 (220 mm bore) and E; washers are separable for individual mounting. A minimum axial load of factor A 3.8 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Speed planning separates the 1,000 r/min thermal reference from the 1,700 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: fit the shaft washer tight on the 220 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 2000 kN working load.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 220 mm bore, oil flow becomes the design variable: the 2000 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Minimum load factor A 3.8 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2000/6300 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 2000/6300 kN ratings and 31000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29344 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 44 the 220 mm bore (code 44 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 3.8) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 3.8 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29344 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29344 E mounted?",
        "a": "Tight shaft washer on the 220 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 3.8 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29344",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×360×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29344-E",
      "29344 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29444-E",
    "brand": "SKF",
    "manufacturer_designation": "29444 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 220,
    "D_mm": 420,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3350,
    "static_load_kN": 9650,
    "fatigue_load_limit_kN": 900,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "weight_g": 75000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29444 E carries 3350 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 220 mm shafts. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29444 E is the stamped steel E window cage. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. One direction only: 29444 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 220 mm bore, oil flow becomes the design variable: the 3350 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 3350/9650 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 8.8 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29444 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 3350/9650 kN ratings and 75000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29444 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29444 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 8.8 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,500 r/min."
      },
      {
        "q": "Which dimensions does the 29444 E have?",
        "a": "A 29444 E measures 220 mm bore × 420 mm outside diameter × 122 mm width (8.661 × 16.535 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3350 kN, static C0 9650 kN, fatigue limit Pu 900 kN, reference speed 850 r/min, limiting speed 1,500 r/min, mass about 75000 g. Minimum axial load factor A 8.8 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29444",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×420×122 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29444",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29444-E",
      "29444 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29248",
    "brand": "SKF",
    "manufacturer_designation": "29248",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 240,
    "D_mm": 340,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 799,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 335,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 16500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29248 is the classic hook-block and screw-end thrust bearing: 240 mm shaft washer bore, 340 mm OD, minimum axial load factor A 1.1, and free rotation under load thanks to the spherical geometry. The designation 29248 separates into 292 (series), 48 (240 mm bore) and no suffix (earlier standard design); washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 3450 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 240 mm bore, oil flow becomes the design variable: the 799 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "the 1,100 r/min reference speed is the thermal criterion under load, the 1,800 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29248.",
      "The 799/3450 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1.1 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 799/3450 kN ratings and 16500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29248?",
        "a": "A 29248 measures 240 mm bore × 340 mm outside diameter × 60 mm width (9.449 × 13.386 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 799 kN, static C0 3450 kN, fatigue limit Pu 335 kN, reference speed 1,100 r/min, limiting speed 1,800 r/min, mass about 16500 g. Minimum axial load factor A 1.1 must be maintained in service."
      },
      {
        "q": "How is the 29248 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 48 the 240 mm bore (code 48 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 1.1) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 1.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29248 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29248-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 240×340×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29248",
      "29248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29348-E",
    "brand": "SKF",
    "manufacturer_designation": "29348 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 240,
    "D_mm": 380,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2040,
    "static_load_kN": 6550,
    "fatigue_load_limit_kN": 630,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "weight_g": 35500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29348 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 85 mm of axial section. Reading the code: 293 gives the dimension series (medium 293 series) and 48 the 240 mm shaft washer bore (code 48 × 5); the E sets the cage design. A minimum axial load of factor A 4.1 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 35500 g mass and 85 mm axial height sit between 240 and 380 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 4.1) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 240 mm bore, oil flow becomes the design variable: the 2040 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,000 r/min reference speed is the thermal criterion under load, the 1,600 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 2040/6550 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 4.1 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 2040/6550 kN ratings and 35500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29348 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29348 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 4.1 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,600 r/min."
      },
      {
        "q": "Which dimensions does the 29348 E have?",
        "a": "A 29348 E measures 240 mm bore × 380 mm outside diameter × 85 mm width (9.449 × 14.961 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2040 kN, static C0 6550 kN, fatigue limit Pu 630 kN, reference speed 1,000 r/min, limiting speed 1,600 r/min, mass about 35500 g. Minimum axial load factor A 4.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29348",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 240×380×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29348-E",
      "29348 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29448-E",
    "brand": "SKF",
    "manufacturer_designation": "29448 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3400,
    "static_load_kN": 10200,
    "fatigue_load_limit_kN": 930,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "weight_g": 80000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29448 E for very heavy one-direction axial load: 3400 kN dynamic and 10200 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. The designation 29448 E separates into 294 (series), 48 (240 mm bore) and E; washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Speed planning separates the 850 r/min thermal reference from the 1,500 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: fit the shaft washer tight on the 240 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3400 kN working load.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 240 mm bore, oil flow becomes the design variable: the 3400 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Minimum load factor A 9.9 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 3400/10200 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 3400/10200 kN ratings and 80000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29448 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29448 E mounted?",
        "a": "Tight shaft washer on the 240 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 9.9 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29448 E?",
        "a": "A 29448 E measures 240 mm bore × 440 mm outside diameter × 122 mm width (9.449 × 17.323 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3400 kN, static C0 10200 kN, fatigue limit Pu 930 kN, reference speed 850 r/min, limiting speed 1,500 r/min, mass about 80000 g. Minimum axial load factor A 9.9 must be maintained in service."
      },
      {
        "q": "How is the 29448 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 48 the 240 mm bore (code 48 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29448",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 240×440×122 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29448",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29448-E",
      "29448 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29252",
    "brand": "SKF",
    "manufacturer_designation": "29252",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 817,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 345,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29252 for very heavy one-direction axial load: 817 kN dynamic and 3650 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29252 is the steel cage of the earlier standard design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 3650 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 260 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 817 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 260 mm bore, oil flow becomes the design variable: the 817 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29252.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 817/3650 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1.3 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 817/3650 kN ratings and 18500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29252 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.3 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,700 r/min."
      },
      {
        "q": "Which dimensions does the 29252 have?",
        "a": "A 29252 measures 260 mm bore × 360 mm outside diameter × 60 mm width (10.236 × 14.173 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 817 kN, static C0 3650 kN, fatigue limit Pu 345 kN, reference speed 1,100 r/min, limiting speed 1,700 r/min, mass about 18500 g. Minimum axial load factor A 1.3 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29252 is the high-speed 292 series, 260×360×60 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29252-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 260×360×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29252",
      "29252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29352-E",
    "brand": "SKF",
    "manufacturer_designation": "29352 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 260,
    "D_mm": 420,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2550,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 780,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 49000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29352 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 95 mm of axial section. In 29352 E, the 293 series fixes the 420 mm OD and 95 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 52 selects the 260 mm seat. The medium 293 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Minimum axial load is explicit at factor A 6.5: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 260 mm bore, oil flow becomes the design variable: the 2550 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2550/8300 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 850 r/min reference speed is the thermal criterion under load, the 1,400 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 2550/8300 kN ratings and 49000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29352 E?",
        "a": "A 29352 E measures 260 mm bore × 420 mm outside diameter × 95 mm width (10.236 × 16.535 × 3.74 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2550 kN, static C0 8300 kN, fatigue limit Pu 780 kN, reference speed 850 r/min, limiting speed 1,400 r/min, mass about 49000 g. Minimum axial load factor A 6.5 must be maintained in service."
      },
      {
        "q": "How is the 29352 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 52 the 260 mm bore (code 52 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 6.5) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 6.5 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29352 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29352",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 260×420×95 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29352-E",
      "29352 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29452-E",
    "brand": "SKF",
    "manufacturer_designation": "29452 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4050,
    "static_load_kN": 12900,
    "fatigue_load_limit_kN": 1080,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29452 E for very heavy one-direction axial load: 4050 kN dynamic and 12900 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. Reading the code: 294 gives the dimension series (heavy 294 series) and 52 the 260 mm shaft washer bore (code 52 × 5); the E sets the cage design. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Selection arithmetic: C 4050 kN against C0 12900 kN gives a C0/C ratio of 3.19 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Verify the minimum axial load (factor A 16) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 260 mm bore, oil flow becomes the design variable: the 4050 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29452 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 16 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 4050/12900 kN ratings and 105000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29452 E is the heavy 294 series, 260×480×132 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29452 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29452 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 16 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,300 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29452",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 260×480×132 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29452",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29452-E",
      "29452 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29256",
    "brand": "SKF",
    "manufacturer_designation": "29256",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 863,
    "static_load_kN": 4000,
    "fatigue_load_limit_kN": 375,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 19500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29256 aligns itself: 280×380×60 mm envelope, 4000 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29256 is the steel cage of the earlier standard design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 4000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 280 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 863 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 280 mm bore, oil flow becomes the design variable: the 863 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 863/4000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1.5 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "the 1,000 r/min reference speed is the thermal criterion under load, the 1,700 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29256.",
      "The 863/4000 kN ratings and 19500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.5 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,700 r/min."
      },
      {
        "q": "Which dimensions does the 29256 have?",
        "a": "A 29256 measures 280 mm bore × 380 mm outside diameter × 60 mm width (11.024 × 14.961 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 863 kN, static C0 4000 kN, fatigue limit Pu 375 kN, reference speed 1,000 r/min, limiting speed 1,700 r/min, mass about 19500 g. Minimum axial load factor A 1.5 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29256 is the high-speed 292 series, 280×380×60 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29256?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29256-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 280×380×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29256",
      "29256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29356-E",
    "brand": "SKF",
    "manufacturer_designation": "29356 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 280,
    "D_mm": 440,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2550,
    "static_load_kN": 8650,
    "fatigue_load_limit_kN": 800,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 53000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29356 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 95 mm of axial section. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29356 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 8650 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 7.1) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 280 mm bore, oil flow becomes the design variable: the 2550 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 2550/8650 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 7.1 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "the 850 r/min reference speed is the thermal criterion under load, the 1,400 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29356 E.",
      "The 2550/8650 kN ratings and 53000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29356 E is the medium 293 series, 280×440×95 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29356 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29356 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 7.1 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,400 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29356",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 280×440×95 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29356-E",
      "29356 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29456-E",
    "brand": "SKF",
    "manufacturer_designation": "29456 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 280,
    "D_mm": 520,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4900,
    "static_load_kN": 15300,
    "fatigue_load_limit_kN": 1320,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 135000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29456 E for very heavy one-direction axial load: 4900 kN dynamic and 15300 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. In 29456 E, the 294 series fixes the 520 mm OD and 145 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 56 selects the 280 mm seat. A minimum axial load of factor A 22 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Minimum axial load is explicit at factor A 22: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: fit the shaft washer tight on the 280 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 4900 kN working load.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 280 mm bore, oil flow becomes the design variable: the 4900 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 4900/15300 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 670 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 4900/15300 kN ratings and 135000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 22) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 22 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29456 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29456 E mounted?",
        "a": "Tight shaft washer on the 280 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 22 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29456 E?",
        "a": "A 29456 E measures 280 mm bore × 520 mm outside diameter × 145 mm width (11.024 × 20.472 × 5.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4900 kN, static C0 15300 kN, fatigue limit Pu 1320 kN, reference speed 670 r/min, limiting speed 1,200 r/min, mass about 135000 g. Minimum axial load factor A 22 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29456",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 280×520×145 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29456",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29456-E",
      "29456 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29260",
    "brand": "SKF",
    "manufacturer_designation": "29260",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1070,
    "static_load_kN": 4800,
    "fatigue_load_limit_kN": 465,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 30500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The high-speed 292 series bearing 29260 carries 1070 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 300 mm shafts. In 29260, the 292 series fixes the 420 mm OD and 73 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 60 selects the 300 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 4800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 2.2) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 300 mm bore, oil flow becomes the design variable: the 1070 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Minimum load factor A 2.2 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 900 r/min reference speed is the thermal criterion under load, the 1,400 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29260.",
      "The 1070/4800 kN ratings and 30500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 2.2) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 2.2 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29260 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29260 mounted?",
        "a": "Tight shaft washer on the 300 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 2.2 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29260?",
        "a": "A 29260 measures 300 mm bore × 420 mm outside diameter × 73 mm width (11.811 × 16.535 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1070 kN, static C0 4800 kN, fatigue limit Pu 465 kN, reference speed 900 r/min, limiting speed 1,400 r/min, mass about 30500 g. Minimum axial load factor A 2.2 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29260-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 300×420×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29260",
      "29260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29360-E",
    "brand": "SKF",
    "manufacturer_designation": "29360 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 300,
    "D_mm": 480,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3100,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 930,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 75000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29360 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 109 mm of axial section. The designation 29360 E separates into 293 (series), 60 (300 mm bore) and E; washers are separable for individual mounting. The medium 293 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Static safety matters for shock duty: compare peak axial force against C0 10600 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 11) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 300 mm bore, oil flow becomes the design variable: the 3100 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "the 750 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29360 E.",
      "The 3100/10600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 11 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 3100/10600 kN ratings and 75000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29360 E?",
        "a": "A 29360 E measures 300 mm bore × 480 mm outside diameter × 109 mm width (11.811 × 18.898 × 4.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3100 kN, static C0 10600 kN, fatigue limit Pu 930 kN, reference speed 750 r/min, limiting speed 1,200 r/min, mass about 75000 g. Minimum axial load factor A 11 must be maintained in service."
      },
      {
        "q": "How is the 29360 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 60 the 300 mm bore (code 60 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 11) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 11 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29360 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29360",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 300×480×109 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29360",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29360-E",
      "29360 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29460-E",
    "brand": "SKF",
    "manufacturer_designation": "29460 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5000,
    "static_load_kN": 16600,
    "fatigue_load_limit_kN": 1340,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29460 E for very heavy one-direction axial load: 5000 kN dynamic and 16600 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29460 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Minimum axial load is explicit at factor A 24: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: fit the shaft washer tight on the 300 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 5000 kN working load.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 300 mm bore, oil flow becomes the design variable: the 5000 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 670 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 5000/16600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 5000/16600 kN ratings and 140000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29460 E is the heavy 294 series, 300×540×145 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29460 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29460 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 24 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,200 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29460",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 300×540×145 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29460",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29460-E",
      "29460 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29264",
    "brand": "SKF",
    "manufacturer_designation": "29264",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1110,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 465,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 33000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29264 is a spherical roller thrust bearing to ISO 104 in the high-speed 292 series: asymmetrical barrel rollers running on a sphered housing washer, sized 320×440×73 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. In 29264, the 292 series fixes the 440 mm OD and 73 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 64 selects the 320 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 5100 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 2.5) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 2.5 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 440 mm washer track.",
      "the 850 r/min reference speed is the thermal criterion under load, the 1,400 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29264.",
      "The 1110/5100 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 2.5 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 1110/5100 kN ratings and 33000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29264 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29264 mounted?",
        "a": "Tight shaft washer on the 320 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 2.5 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29264?",
        "a": "A 29264 measures 320 mm bore × 440 mm outside diameter × 73 mm width (12.598 × 17.323 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1110 kN, static C0 5100 kN, fatigue limit Pu 465 kN, reference speed 850 r/min, limiting speed 1,400 r/min, mass about 33000 g. Minimum axial load factor A 2.5 must be maintained in service."
      },
      {
        "q": "How is the 29264 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 64 the 320 mm bore (code 64 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29264-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 320×440×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29264",
      "29264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29364-E",
    "brand": "SKF",
    "manufacturer_designation": "29364 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 320,
    "D_mm": 500,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3350,
    "static_load_kN": 11200,
    "fatigue_load_limit_kN": 1000,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 78000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29364 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 109 mm of axial section. Reading the code: 293 gives the dimension series (medium 293 series) and 64 the 320 mm shaft washer bore (code 64 × 5); the E sets the cage design. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Selection arithmetic: C 3350 kN against C0 11200 kN gives a C0/C ratio of 3.34 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: fit the shaft washer tight on the 320 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3350 kN working load.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 12 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 500 mm washer track.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29364 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 12 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 3350/11200 kN ratings and 78000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29364 E is the medium 293 series, 320×500×109 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29364 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29364 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 12 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,200 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29364",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 320×500×109 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29364",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29364-E",
      "29364 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29464-E",
    "brand": "SKF",
    "manufacturer_designation": "29464 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5700,
    "static_load_kN": 19000,
    "fatigue_load_limit_kN": 1530,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 175000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29464 E for very heavy one-direction axial load: 5700 kN dynamic and 19000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. The designation 29464 E separates into 294 (series), 64 (320 mm bore) and E; washers are separable for individual mounting. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. The 175000 g mass and 155 mm axial height sit between 320 and 580 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 320 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 5700 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 32 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 580 mm washer track.",
      "the 600 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29464 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 5700/19000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 5700/19000 kN ratings and 175000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29464 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 64 the 320 mm bore (code 64 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 32) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 32 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29464 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29464 E mounted?",
        "a": "Tight shaft washer on the 320 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 32 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29464",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 320×580×155 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29464",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29464-E",
      "29464 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29268",
    "brand": "SKF",
    "manufacturer_designation": "29268",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1130,
    "static_load_kN": 5400,
    "fatigue_load_limit_kN": 480,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 33500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29268 is the classic hook-block and screw-end thrust bearing: 340 mm shaft washer bore, 460 mm OD, minimum axial load factor A 2.8, and free rotation under load thanks to the spherical geometry. In 29268, the 292 series fixes the 460 mm OD and 73 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 68 selects the 340 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 5400 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 2.8) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 2.8 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 460 mm washer track.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1130/5400 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29268.",
      "Minimum load factor A 2.8 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 1130/5400 kN ratings and 33500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is a 29268 mounted?",
        "a": "Tight shaft washer on the 340 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 2.8 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29268?",
        "a": "A 29268 measures 340 mm bore × 460 mm outside diameter × 73 mm width (13.386 × 18.11 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1130 kN, static C0 5400 kN, fatigue limit Pu 480 kN, reference speed 850 r/min, limiting speed 1,300 r/min, mass about 33500 g. Minimum axial load factor A 2.8 must be maintained in service."
      },
      {
        "q": "How is the 29268 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 68 the 340 mm bore (code 68 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 2.8) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 2.8 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29268",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29268",
      "29268"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29368",
    "brand": "SKF",
    "manufacturer_designation": "29368",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 340,
    "D_mm": 540,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2710,
    "static_load_kN": 11000,
    "fatigue_load_limit_kN": 950,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29368 for very heavy one-direction axial load: 2710 kN dynamic and 11000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29368 is the steel cage of the earlier standard design. A minimum axial load of factor A 11 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 105000 g mass and 122 mm axial height sit between 340 and 540 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 11) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 11 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 540 mm washer track.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29368.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 11 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 2710/11000 kN ratings and 105000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 11 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,100 r/min."
      },
      {
        "q": "Which dimensions does the 29368 have?",
        "a": "A 29368 measures 340 mm bore × 540 mm outside diameter × 122 mm width (13.386 × 21.26 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2710 kN, static C0 11000 kN, fatigue limit Pu 950 kN, reference speed 600 r/min, limiting speed 1,100 r/min, mass about 105000 g. Minimum axial load factor A 11 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29368 is the medium 293 series, 340×540×122 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29368?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29368",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29368",
      "29368"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29468-E",
    "brand": "SKF",
    "manufacturer_designation": "29468 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 340,
    "D_mm": 620,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6700,
    "static_load_kN": 22400,
    "fatigue_load_limit_kN": 1760,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 220000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29468 E is a spherical roller thrust bearing to ISO 104 in the heavy 294 series: asymmetrical barrel rollers running on a sphered housing washer, sized 340×620×170 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. In 29468 E, the 294 series fixes the 620 mm OD and 170 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 68 selects the 340 mm seat. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 22400 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 46) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 46 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 620 mm washer track.",
      "the 560 r/min reference speed is the thermal criterion under load, the 1,000 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29468 E.",
      "The 6700/22400 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 46 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 6700/22400 kN ratings and 220000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 46) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 46 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29468 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29468 E mounted?",
        "a": "Tight shaft washer on the 340 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 46 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29468 E?",
        "a": "A 29468 E measures 340 mm bore × 620 mm outside diameter × 170 mm width (13.386 × 24.409 × 6.693 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6700 kN, static C0 22400 kN, fatigue limit Pu 1760 kN, reference speed 560 r/min, limiting speed 1,000 r/min, mass about 220000 g. Minimum axial load factor A 46 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29468",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29468-E",
      "29468 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29272",
    "brand": "SKF",
    "manufacturer_designation": "29272",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 360,
    "D_mm": 500,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 6800,
    "fatigue_load_limit_kN": 585,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 52000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29272 for very heavy one-direction axial load: 1460 kN dynamic and 6800 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. Reading the code: 292 gives the dimension series (high-speed 292 series) and 72 the 360 mm shaft washer bore (code 72 × 5); the unsuffixed standard execution sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 6800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 4.4 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 500 mm washer track.",
      "The 1460/6800 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 4.4 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "the 750 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29272.",
      "The 1460/6800 kN ratings and 52000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29272?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29272 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 4.4 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,200 r/min."
      },
      {
        "q": "Which dimensions does the 29272 have?",
        "a": "A 29272 measures 360 mm bore × 500 mm outside diameter × 85 mm width (14.173 × 19.685 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1460 kN, static C0 6800 kN, fatigue limit Pu 585 kN, reference speed 750 r/min, limiting speed 1,200 r/min, mass about 52000 g. Minimum axial load factor A 4.4 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29272",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29272",
      "29272"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29372",
    "brand": "SKF",
    "manufacturer_designation": "29372",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 360,
    "D_mm": 560,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2760,
    "static_load_kN": 11600,
    "fatigue_load_limit_kN": 980,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29372 is the classic hook-block and screw-end thrust bearing: 360 mm shaft washer bore, 560 mm OD, minimum axial load factor A 13, and free rotation under load thanks to the spherical geometry. In 29372, the 293 series fixes the 560 mm OD and 122 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 72 selects the 360 mm seat. A minimum axial load of factor A 13 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 110000 g mass and 122 mm axial height sit between 360 and 560 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 13 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 560 mm washer track.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2760/11600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "the 600 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29372.",
      "The 2760/11600 kN ratings and 110000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 13) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 13 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29372 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29372 mounted?",
        "a": "Tight shaft washer on the 360 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 13 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29372?",
        "a": "A 29372 measures 360 mm bore × 560 mm outside diameter × 122 mm width (14.173 × 22.047 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2760 kN, static C0 11600 kN, fatigue limit Pu 980 kN, reference speed 600 r/min, limiting speed 1,100 r/min, mass about 110000 g. Minimum axial load factor A 13 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29372",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29372",
      "29372"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29472-EM",
    "brand": "SKF",
    "manufacturer_designation": "29472 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 360,
    "D_mm": 640,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6200,
    "static_load_kN": 21200,
    "fatigue_load_limit_kN": 1630,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 230000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29472 EM carries 6200 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 360 mm shafts. Reading the code: 294 gives the dimension series (heavy 294 series) and 72 the 360 mm shaft washer bore (code 72 × 5); the EM sets the cage design. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Static safety matters for shock duty: compare peak axial force against C0 21200 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 360 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 6200 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 41 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 640 mm washer track.",
      "The 6200/21200 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 41 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "the 560 r/min reference speed is the thermal criterion under load, the 950 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29472 EM.",
      "The 6200/21200 kN ratings and 230000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 29472 EM have?",
        "a": "A 29472 EM measures 360 mm bore × 640 mm outside diameter × 170 mm width (14.173 × 25.197 × 6.693 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6200 kN, static C0 21200 kN, fatigue limit Pu 1630 kN, reference speed 560 r/min, limiting speed 950 r/min, mass about 230000 g. Minimum axial load factor A 41 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29472 EM is the heavy 294 series, 360×640×170 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29472 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      },
      {
        "q": "Where is the 29472 EM typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29472",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29472-EM",
      "29472 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29276",
    "brand": "SKF",
    "manufacturer_designation": "29276",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1580,
    "static_load_kN": 7650,
    "fatigue_load_limit_kN": 655,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 53000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29276 aligns itself: 380×520×85 mm envelope, 7650 kN static rating, one load direction. Reading the code: 292 gives the dimension series (high-speed 292 series) and 76 the 380 mm shaft washer bore (code 76 × 5); the unsuffixed standard execution sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 7650 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 5.6 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 520 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 700 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 5.6 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29276.",
      "The 1580/7650 kN ratings and 53000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29276 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 5.6 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,100 r/min."
      },
      {
        "q": "Which dimensions does the 29276 have?",
        "a": "A 29276 measures 380 mm bore × 520 mm outside diameter × 85 mm width (14.961 × 20.472 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1580 kN, static C0 7650 kN, fatigue limit Pu 655 kN, reference speed 700 r/min, limiting speed 1,100 r/min, mass about 53000 g. Minimum axial load factor A 5.6 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29276 is the high-speed 292 series, 380×520×85 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29276",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29276",
      "29276"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29376",
    "brand": "SKF",
    "manufacturer_designation": "29376",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 380,
    "D_mm": 600,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3340,
    "static_load_kN": 14000,
    "fatigue_load_limit_kN": 1160,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The medium 293 series bearing 29376 carries 3340 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 380 mm shafts. In 29376, the 293 series fixes the 600 mm OD and 132 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 76 selects the 380 mm seat. A minimum axial load of factor A 19 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 140000 g mass and 132 mm axial height sit between 380 and 600 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 19 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 600 mm washer track.",
      "Minimum load factor A 19 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 530 r/min reference speed is the thermal criterion under load, the 1,000 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29376.",
      "The 3340/14000 kN ratings and 140000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29376 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29376 mounted?",
        "a": "Tight shaft washer on the 380 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 19 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29376?",
        "a": "A 29376 measures 380 mm bore × 600 mm outside diameter × 132 mm width (14.961 × 23.622 × 5.197 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3340 kN, static C0 14000 kN, fatigue limit Pu 1160 kN, reference speed 530 r/min, limiting speed 1,000 r/min, mass about 140000 g. Minimum axial load factor A 19 must be maintained in service."
      },
      {
        "q": "How is the 29376 designation read?",
        "a": "293 is the dimension series (medium 293 series) and 76 the 380 mm bore (code 76 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29376",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29376",
      "29376"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29476-EM",
    "brand": "SKF",
    "manufacturer_designation": "29476 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 380,
    "D_mm": 670,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6800,
    "static_load_kN": 24000,
    "fatigue_load_limit_kN": 1860,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 260000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29476 EM aligns itself: 380×670×175 mm envelope, 24000 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29476 EM is the machined brass EM cage. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. Minimum axial load is explicit at factor A 53: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 53 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 670 mm washer track.",
      "The 6800/24000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 53 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 530 r/min reference speed is the thermal criterion under load, the 900 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 6800/24000 kN ratings and 260000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 29476 EM have?",
        "a": "A 29476 EM measures 380 mm bore × 670 mm outside diameter × 175 mm width (14.961 × 26.378 × 6.89 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6800 kN, static C0 24000 kN, fatigue limit Pu 1860 kN, reference speed 530 r/min, limiting speed 900 r/min, mass about 260000 g. Minimum axial load factor A 53 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29476 EM is the heavy 294 series, 380×670×175 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29476 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      },
      {
        "q": "Where is the 29476 EM typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29476",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29476-EM",
      "29476 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29280",
    "brand": "SKF",
    "manufacturer_designation": "29280",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1610,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 695,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 55500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The high-speed 292 series bearing 29280 carries 1610 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 400 mm shafts. The designation 29280 separates into 292 (series), 80 (400 mm bore) and no suffix (earlier standard design); washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 8000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 400 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 1610 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 6.1 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 540 mm washer track.",
      "the 700 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29280.",
      "The 1610/8000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 6.1 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 1610/8000 kN ratings and 55500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29280 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 80 the 400 mm bore (code 80 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 6.1) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 6.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29280 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29280 mounted?",
        "a": "Tight shaft washer on the 400 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 6.1 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29280",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29280",
      "29280"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29380",
    "brand": "SKF",
    "manufacturer_designation": "29380",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 400,
    "D_mm": 620,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3450,
    "static_load_kN": 14600,
    "fatigue_load_limit_kN": 1200,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 150000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29380 aligns itself: 400×620×132 mm envelope, 14600 kN static rating, one load direction. Reading the code: 293 gives the dimension series (medium 293 series) and 80 the 400 mm shaft washer bore (code 80 × 5); the unsuffixed standard execution sets the cage design. A minimum axial load of factor A 20 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 150000 g mass and 132 mm axial height sit between 400 and 620 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 400 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3450 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 20 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 620 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 530 r/min reference speed is the thermal criterion under load, the 950 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 3450/14600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 20 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 3450/14600 kN ratings and 150000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29380 is the medium 293 series, 400×620×132 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29380?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29380 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 20 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 950 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29380",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29380",
      "29380"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29480-EM",
    "brand": "SKF",
    "manufacturer_designation": "29480 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 400,
    "D_mm": 710,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 7650,
    "static_load_kN": 26500,
    "fatigue_load_limit_kN": 1960,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 310000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29480 EM for very heavy one-direction axial load: 7650 kN dynamic and 26500 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29480 EM is the machined brass EM cage. A minimum axial load of factor A 62 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 310000 g mass and 185 mm axial height sit between 400 and 710 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 62 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 710 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 480 r/min reference speed is the thermal criterion under load, the 850 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 7650/26500 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 62 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 7650/26500 kN ratings and 310000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29480 EM is the heavy 294 series, 400×710×185 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29480 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      },
      {
        "q": "Where is the 29480 EM typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 62 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 850 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29480",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29480-EM",
      "29480 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29284",
    "brand": "SKF",
    "manufacturer_designation": "29284",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 420,
    "D_mm": 580,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1990,
    "static_load_kN": 9800,
    "fatigue_load_limit_kN": 815,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 75500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29284 is a spherical roller thrust bearing to ISO 104 in the high-speed 292 series: asymmetrical barrel rollers running on a sphered housing washer, sized 420×580×95 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. The designation 29284 separates into 292 (series), 84 (420 mm bore) and no suffix (earlier standard design); washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 9800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 420 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 1990 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 9.1 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 580 mm washer track.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1990/9800 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29284.",
      "Minimum load factor A 9.1 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 1990/9800 kN ratings and 75500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 9.1) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 9.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29284 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29284 mounted?",
        "a": "Tight shaft washer on the 420 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 9.1 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29284?",
        "a": "A 29284 measures 420 mm bore × 580 mm outside diameter × 95 mm width (16.535 × 22.835 × 3.74 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1990 kN, static C0 9800 kN, fatigue limit Pu 815 kN, reference speed 630 r/min, limiting speed 1,000 r/min, mass about 75500 g. Minimum axial load factor A 9.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29284",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29284",
      "29284"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29384",
    "brand": "SKF",
    "manufacturer_designation": "29384",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 420,
    "D_mm": 650,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3740,
    "static_load_kN": 16000,
    "fatigue_load_limit_kN": 1290,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 170000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29384 denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the steel cage of the earlier standard design guides the rollers under 140 mm of axial section. Reading the code: 293 gives the dimension series (medium 293 series) and 84 the 420 mm shaft washer bore (code 84 × 5); the unsuffixed standard execution sets the cage design. A minimum axial load of factor A 24 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 170000 g mass and 140 mm axial height sit between 420 and 650 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 420 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3740 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 24 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 650 mm washer track.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29384.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 24 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 3740/16000 kN ratings and 170000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29384?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29384 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 24 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 900 r/min."
      },
      {
        "q": "Which dimensions does the 29384 have?",
        "a": "A 29384 measures 420 mm bore × 650 mm outside diameter × 140 mm width (16.535 × 25.591 × 5.512 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3740 kN, static C0 16000 kN, fatigue limit Pu 1290 kN, reference speed 500 r/min, limiting speed 900 r/min, mass about 170000 g. Minimum axial load factor A 24 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29384",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29384",
      "29384"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29484-EM",
    "brand": "SKF",
    "manufacturer_designation": "29484 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 420,
    "D_mm": 730,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 7800,
    "static_load_kN": 27500,
    "fatigue_load_limit_kN": 2080,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 325000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29484 EM aligns itself: 420×730×185 mm envelope, 27500 kN static rating, one load direction. In 29484 EM, the 294 series fixes the 730 mm OD and 185 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 84 selects the 420 mm seat. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Selection arithmetic: C 7800 kN against C0 27500 kN gives a C0/C ratio of 3.53 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 69 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 730 mm washer track.",
      "Minimum load factor A 69 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29484 EM.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 7800/27500 kN ratings and 325000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29484 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 84 the 420 mm bore (code 84 × 5); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 69) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 69 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29484 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29484 EM mounted?",
        "a": "Tight shaft washer on the 420 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 69 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29484",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29484-EM",
      "29484 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29288",
    "brand": "SKF",
    "manufacturer_designation": "29288",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2070,
    "static_load_kN": 10400,
    "fatigue_load_limit_kN": 850,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 78000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29288 is the classic hook-block and screw-end thrust bearing: 440 mm shaft washer bore, 600 mm OD, minimum axial load factor A 10, and free rotation under load thanks to the spherical geometry. The designation 29288 separates into 292 (series), 88 (440 mm bore) and no suffix (earlier standard design); washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 10400 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 440 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 2070 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 10 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 600 mm washer track.",
      "Minimum load factor A 10 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 630 r/min reference speed is the thermal criterion under load, the 1,000 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29288.",
      "The 2070/10400 kN ratings and 78000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29288 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29288 mounted?",
        "a": "Tight shaft washer on the 440 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 10 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29288?",
        "a": "A 29288 measures 440 mm bore × 600 mm outside diameter × 95 mm width (17.323 × 23.622 × 3.74 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2070 kN, static C0 10400 kN, fatigue limit Pu 850 kN, reference speed 630 r/min, limiting speed 1,000 r/min, mass about 78000 g. Minimum axial load factor A 10 must be maintained in service."
      },
      {
        "q": "How is the 29288 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 88 the 440 mm bore (code 88 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29288",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29288",
      "29288"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29388-EM",
    "brand": "SKF",
    "manufacturer_designation": "29388 EM",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 440,
    "D_mm": 680,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5200,
    "static_load_kN": 19300,
    "fatigue_load_limit_kN": 1560,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 180000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29388 EM aligns itself: 440×680×145 mm envelope, 19300 kN static rating, one load direction. The designation 29388 EM separates into 293 (series), 88 (440 mm bore) and EM; washers are separable for individual mounting. A minimum axial load of factor A 34 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Selection arithmetic: C 5200 kN against C0 19300 kN gives a C0/C ratio of 3.71 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: fit the shaft washer tight on the 440 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 5200 kN working load.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 34 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 680 mm washer track.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 5200/19300 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 34 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 5200/19300 kN ratings and 180000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29388 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29388 EM mounted?",
        "a": "Tight shaft washer on the 440 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 34 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29388 EM?",
        "a": "A 29388 EM measures 440 mm bore × 680 mm outside diameter × 145 mm width (17.323 × 26.772 × 5.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5200 kN, static C0 19300 kN, fatigue limit Pu 1560 kN, reference speed 530 r/min, limiting speed 850 r/min, mass about 180000 g. Minimum axial load factor A 34 must be maintained in service."
      },
      {
        "q": "How is the 29388 EM designation read?",
        "a": "293 is the dimension series (medium 293 series) and 88 the 440 mm bore (code 88 × 5); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29388",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29388-EM",
      "29388 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29488-EM",
    "brand": "SKF",
    "manufacturer_designation": "29488 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 440,
    "D_mm": 780,
    "B_mm": 206,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9000,
    "static_load_kN": 32000,
    "fatigue_load_limit_kN": 2320,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 410000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29488 EM carries 9000 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 440 mm shafts. The designation 29488 EM separates into 294 (series), 88 (440 mm bore) and EM; washers are separable for individual mounting. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. The 410000 g mass and 206 mm axial height sit between 440 and 780 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 91 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 780 mm washer track.",
      "Minimum load factor A 91 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 430 r/min reference speed is the thermal criterion under load, the 750 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29488 EM.",
      "The 9000/32000 kN ratings and 410000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29488 EM?",
        "a": "A 29488 EM measures 440 mm bore × 780 mm outside diameter × 206 mm width (17.323 × 30.709 × 8.11 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9000 kN, static C0 32000 kN, fatigue limit Pu 2320 kN, reference speed 430 r/min, limiting speed 750 r/min, mass about 410000 g. Minimum axial load factor A 91 must be maintained in service."
      },
      {
        "q": "How is the 29488 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 88 the 440 mm bore (code 88 × 5); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 91) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 91 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29488 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29488",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29488-EM",
      "29488 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29292",
    "brand": "SKF",
    "manufacturer_designation": "29292",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2070,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 865,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 81000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29292 for very heavy one-direction axial load: 2070 kN dynamic and 10600 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29292 is the steel cage of the earlier standard design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 10600 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 11) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 11 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 620 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 600 r/min reference speed is the thermal criterion under load, the 950 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 11 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29292.",
      "The 2070/10600 kN ratings and 81000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29292 is the high-speed 292 series, 460×620×95 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29292?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29292 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 11 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 950 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29292",
      "29292"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29392",
    "brand": "SKF",
    "manufacturer_designation": "29392",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 460,
    "D_mm": 710,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4310,
    "static_load_kN": 19000,
    "fatigue_load_limit_kN": 1500,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 215000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29392 is the classic hook-block and screw-end thrust bearing: 460 mm shaft washer bore, 710 mm OD, minimum axial load factor A 34, and free rotation under load thanks to the spherical geometry. Reading the code: 293 gives the dimension series (medium 293 series) and 92 the 460 mm shaft washer bore (code 92 × 5); the unsuffixed standard execution sets the cage design. A minimum axial load of factor A 34 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Minimum axial load is explicit at factor A 34: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 34) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 34 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 710 mm washer track.",
      "The 4310/19000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 34 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 450 r/min reference speed is the thermal criterion under load, the 800 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 4310/19000 kN ratings and 215000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29392 is the medium 293 series, 460×710×150 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29392?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29392 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 34 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 800 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29392",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29392",
      "29392"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29492-EM",
    "brand": "SKF",
    "manufacturer_designation": "29492 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 460,
    "D_mm": 800,
    "B_mm": 206,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9300,
    "static_load_kN": 33500,
    "fatigue_load_limit_kN": 2450,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 425000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29492 EM is the classic hook-block and screw-end thrust bearing: 460 mm shaft washer bore, 800 mm OD, minimum axial load factor A 100, and free rotation under load thanks to the spherical geometry. The designation 29492 EM separates into 294 (series), 92 (460 mm bore) and EM; washers are separable for individual mounting. A minimum axial load of factor A 100 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. One direction only: 29492 EM cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Verify the minimum axial load (factor A 100) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 100 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 800 mm washer track.",
      "the 430 r/min reference speed is the thermal criterion under load, the 750 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29492 EM.",
      "Minimum load factor A 100 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 9300/33500 kN ratings and 425000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 100) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 100 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29492 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29492 EM mounted?",
        "a": "Tight shaft washer on the 460 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 100 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29492 EM?",
        "a": "A 29492 EM measures 460 mm bore × 800 mm outside diameter × 206 mm width (18.11 × 31.496 × 8.11 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9300 kN, static C0 33500 kN, fatigue limit Pu 2450 kN, reference speed 430 r/min, limiting speed 750 r/min, mass about 425000 g. Minimum axial load factor A 100 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29492",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29492-EM",
      "29492 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29296",
    "brand": "SKF",
    "manufacturer_designation": "29296",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 103,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2350,
    "static_load_kN": 11800,
    "fatigue_load_limit_kN": 950,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 98000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29296 aligns itself: 480×650×103 mm envelope, 11800 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29296 is the steel cage of the earlier standard design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 11800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 13) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 13 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 650 mm washer track.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29296.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2350/11800 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 13 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 2350/11800 kN ratings and 98000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29296?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29296 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 13 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 900 r/min."
      },
      {
        "q": "Which dimensions does the 29296 have?",
        "a": "A 29296 measures 480 mm bore × 650 mm outside diameter × 103 mm width (18.898 × 25.591 × 4.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2350 kN, static C0 11800 kN, fatigue limit Pu 950 kN, reference speed 560 r/min, limiting speed 900 r/min, mass about 98000 g. Minimum axial load factor A 13 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29296",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29296",
      "29296"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29496-EM",
    "brand": "SKF",
    "manufacturer_designation": "29496 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 480,
    "D_mm": 850,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9550,
    "static_load_kN": 39000,
    "fatigue_load_limit_kN": 2800,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 550000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29496 EM carries 9550 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 480 mm shafts. In 29496 EM, the 294 series fixes the 850 mm OD and 224 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 96 selects the 480 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Minimum axial load is explicit at factor A 140: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 140 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 850 mm washer track.",
      "the 340 r/min reference speed is the thermal criterion under load, the 670 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29496 EM.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 140 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 9550/39000 kN ratings and 550000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29496 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 96 the 480 mm bore (code 96 × 5); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 140) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 140 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29496 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29496 EM mounted?",
        "a": "Tight shaft washer on the 480 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 140 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29496",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29496-EM",
      "29496 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-500",
    "brand": "SKF",
    "manufacturer_designation": "292/500",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 103,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2390,
    "static_load_kN": 12500,
    "fatigue_load_limit_kN": 1000,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 100000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 292/500 for very heavy one-direction axial load: 2390 kN dynamic and 12500 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. The designation 292/500 separates into 292 (series), 500 mm (slash-size) (500 mm bore — bore 500 mm is written directly after the slash) and no suffix (earlier standard design); washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Speed planning separates the 560 r/min thermal reference from the 900 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 15 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 670 mm washer track.",
      "the 560 r/min reference speed is the thermal criterion under load, the 900 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 292/500.",
      "Minimum load factor A 15 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 2390/12500 kN ratings and 100000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 292/500 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 292/500 mounted?",
        "a": "Tight shaft washer on the 500 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 15 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 292/500?",
        "a": "A 292/500 measures 500 mm bore × 670 mm outside diameter × 103 mm width (19.685 × 26.378 × 4.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2390 kN, static C0 12500 kN, fatigue limit Pu 1000 kN, reference speed 560 r/min, limiting speed 900 r/min, mass about 100000 g. Minimum axial load factor A 15 must be maintained in service."
      },
      {
        "q": "How is the 292/500 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 500 mm (slash-size) the 500 mm bore (the bore is written directly after the slash (no bore code)); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-500",
      "292/500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "293-500",
    "brand": "SKF",
    "manufacturer_designation": "293/500",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 500,
    "D_mm": 750,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4490,
    "static_load_kN": 20400,
    "fatigue_load_limit_kN": 1560,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 235000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 293/500 aligns itself: 500×750×150 mm envelope, 20400 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 293/500 is the steel cage of the earlier standard design. The medium 293 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. One direction only: 293/500 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Verify the minimum axial load (factor A 40) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 40 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 750 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 430 r/min reference speed is the thermal criterion under load, the 800 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 40 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 293/500.",
      "The 4490/20400 kN ratings and 235000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 40 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 800 r/min."
      },
      {
        "q": "Which dimensions does the 293/500 have?",
        "a": "A 293/500 measures 500 mm bore × 750 mm outside diameter × 150 mm width (19.685 × 29.528 × 5.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4490 kN, static C0 20400 kN, fatigue limit Pu 1560 kN, reference speed 430 r/min, limiting speed 800 r/min, mass about 235000 g. Minimum axial load factor A 40 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 293/500 is the medium 293 series, 500×750×150 mm."
      },
      {
        "q": "What do E, EM and EF mean on 293/500?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "293",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "293-500",
      "293/500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-500-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/500 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 500,
    "D_mm": 870,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9370,
    "static_load_kN": 40000,
    "fatigue_load_limit_kN": 2850,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 560000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 294/500 EM carries 9370 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 500 mm shafts. The designation 294/500 EM separates into 294 (series), 500 mm (slash-size) (500 mm bore — bore 500 mm is written directly after the slash) and EM; washers are separable for individual mounting. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. Minimum axial load is explicit at factor A 150: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 150) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 150 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 870 mm washer track.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 9370/40000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 340 r/min reference speed is the thermal criterion under load, the 670 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 9370/40000 kN ratings and 560000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 294/500 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 500 mm (slash-size) the 500 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 150) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 150 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 294/500 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 294/500 EM mounted?",
        "a": "Tight shaft washer on the 500 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 150 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-500-EM",
      "294/500 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-530-EM",
    "brand": "SKF",
    "manufacturer_designation": "292/530 EM",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 530,
    "D_mm": 710,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3110,
    "static_load_kN": 15300,
    "fatigue_load_limit_kN": 1220,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 115000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 292/530 EM for very heavy one-direction axial load: 3110 kN dynamic and 15300 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. Reading the code: 292 gives the dimension series (high-speed 292 series) and 530 mm (slash-size) the 530 mm shaft washer bore (the bore is written directly after the slash (no bore code)); the EM sets the cage design. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 15300 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 22) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 22 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 710 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 530 r/min reference speed is the thermal criterion under load, the 850 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 22 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 292/530 EM.",
      "The 3110/15300 kN ratings and 115000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 22 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 850 r/min."
      },
      {
        "q": "Which dimensions does the 292/530 EM have?",
        "a": "A 292/530 EM measures 530 mm bore × 710 mm outside diameter × 109 mm width (20.866 × 27.953 × 4.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3110 kN, static C0 15300 kN, fatigue limit Pu 1220 kN, reference speed 530 r/min, limiting speed 850 r/min, mass about 115000 g. Minimum axial load factor A 22 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 292/530 EM is the high-speed 292 series, 530×710×109 mm."
      },
      {
        "q": "What do E, EM and EF mean on 292/530 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-530-EM",
      "292/530 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "293-530-EM",
    "brand": "SKF",
    "manufacturer_designation": "293/530 EM",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 530,
    "D_mm": 800,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5870,
    "static_load_kN": 26500,
    "fatigue_load_limit_kN": 2080,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 265000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The medium 293 series bearing 293/530 EM carries 5870 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 530 mm shafts. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 293/530 EM is the machined brass EM cage. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. The 265000 g mass and 160 mm axial height sit between 530 and 800 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 530 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 5870 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 67 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 800 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 400 r/min reference speed is the thermal criterion under load, the 750 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 5870/26500 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 67 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 5870/26500 kN ratings and 265000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 67 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 750 r/min."
      },
      {
        "q": "Which dimensions does the 293/530 EM have?",
        "a": "A 293/530 EM measures 530 mm bore × 800 mm outside diameter × 160 mm width (20.866 × 31.496 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5870 kN, static C0 26500 kN, fatigue limit Pu 2080 kN, reference speed 400 r/min, limiting speed 750 r/min, mass about 265000 g. Minimum axial load factor A 67 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 293/530 EM is the medium 293 series, 530×800×160 mm."
      },
      {
        "q": "What do E, EM and EF mean on 293/530 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "293",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "293-530-EM",
      "293/530 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-530-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/530 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 530,
    "D_mm": 920,
    "B_mm": 236,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 10500,
    "static_load_kN": 44000,
    "fatigue_load_limit_kN": 3100,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 630,
    "max_rpm": 630,
    "weight_g": 650000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 294/530 EM carries 10500 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 530 mm shafts. In 294/530 EM, the 294 series fixes the 920 mm OD and 236 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 530 mm (slash-size) selects the 530 mm seat. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Speed planning separates the 320 r/min thermal reference from the 630 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Verify the minimum axial load (factor A 180) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 180 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 920 mm washer track.",
      "Minimum load factor A 180 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 10500/44000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 10500/44000 kN ratings and 650000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is a 294/530 EM mounted?",
        "a": "Tight shaft washer on the 530 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 180 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 294/530 EM?",
        "a": "A 294/530 EM measures 530 mm bore × 920 mm outside diameter × 236 mm width (20.866 × 36.22 × 9.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10500 kN, static C0 44000 kN, fatigue limit Pu 3100 kN, reference speed 320 r/min, limiting speed 630 r/min, mass about 650000 g. Minimum axial load factor A 180 must be maintained in service."
      },
      {
        "q": "How is the 294/530 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 530 mm (slash-size) the 530 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 180) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 180 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-530-EM",
      "294/530 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-560",
    "brand": "SKF",
    "manufacturer_designation": "292/560",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 560,
    "D_mm": 750,
    "B_mm": 115,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2990,
    "static_load_kN": 16000,
    "fatigue_load_limit_kN": 1220,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 292/560 for very heavy one-direction axial load: 2990 kN dynamic and 16000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. In 292/560, the 292 series fixes the 750 mm OD and 115 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 560 mm (slash-size) selects the 560 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Speed planning separates the 480 r/min thermal reference from the 800 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 24 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 750 mm washer track.",
      "the 480 r/min reference speed is the thermal criterion under load, the 800 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 292/560.",
      "Minimum load factor A 24 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 2990/16000 kN ratings and 140000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 292/560?",
        "a": "A 292/560 measures 560 mm bore × 750 mm outside diameter × 115 mm width (22.047 × 29.528 × 4.528 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2990 kN, static C0 16000 kN, fatigue limit Pu 1220 kN, reference speed 480 r/min, limiting speed 800 r/min, mass about 140000 g. Minimum axial load factor A 24 must be maintained in service."
      },
      {
        "q": "How is the 292/560 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 560 mm (slash-size) the 560 mm bore (the bore is written directly after the slash (no bore code)); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 24) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 24 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 292/560 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-560",
      "292/560"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-560-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/560 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 560,
    "D_mm": 980,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 12000,
    "static_load_kN": 51000,
    "fatigue_load_limit_kN": 3550,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 560,
    "max_rpm": 560,
    "weight_g": 810000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 294/560 EM denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the machined brass EM cage guides the rollers under 250 mm of axial section. The designation 294/560 EM separates into 294 (series), 560 mm (slash-size) (560 mm bore — bore 560 mm is written directly after the slash) and EM; washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. One direction only: 294/560 EM cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 560 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 12000 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 250 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 980 mm washer track.",
      "the 300 r/min reference speed is the thermal criterion under load, the 560 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/560 EM.",
      "Minimum load factor A 250 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 12000/51000 kN ratings and 810000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 294/560 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 560 mm (slash-size) the 560 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 250) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 250 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 294/560 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 294/560 EM mounted?",
        "a": "Tight shaft washer on the 560 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 250 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-560-EM",
      "294/560 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-600-EM",
    "brand": "SKF",
    "manufacturer_designation": "292/600 EM",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 600,
    "D_mm": 800,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3740,
    "static_load_kN": 18600,
    "fatigue_load_limit_kN": 1460,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "weight_g": 170000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "292/600 EM is the classic hook-block and screw-end thrust bearing: 600 mm shaft washer bore, 800 mm OD, minimum axial load factor A 33, and free rotation under load thanks to the spherical geometry. In 292/600 EM, the 292 series fixes the 800 mm OD and 122 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 600 mm (slash-size) selects the 600 mm seat. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 18600 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 33 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 800 mm washer track.",
      "the 450 r/min reference speed is the thermal criterion under load, the 700 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 292/600 EM.",
      "The 3740/18600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 33 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 3740/18600 kN ratings and 170000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is a 292/600 EM mounted?",
        "a": "Tight shaft washer on the 600 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 33 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 292/600 EM?",
        "a": "A 292/600 EM measures 600 mm bore × 800 mm outside diameter × 122 mm width (23.622 × 31.496 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3740 kN, static C0 18600 kN, fatigue limit Pu 1460 kN, reference speed 450 r/min, limiting speed 700 r/min, mass about 170000 g. Minimum axial load factor A 33 must be maintained in service."
      },
      {
        "q": "How is the 292/600 EM designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 600 mm (slash-size) the 600 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 33) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 33 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-600-EM",
      "292/600 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-600-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/600 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 600,
    "D_mm": 1030,
    "B_mm": 258,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 13100,
    "static_load_kN": 56000,
    "fatigue_load_limit_kN": 4000,
    "reference_speed_rpm": 280,
    "limiting_speed_rpm": 530,
    "max_rpm": 530,
    "weight_g": 845000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 294/600 EM aligns itself: 600×1030×258 mm envelope, 56000 kN static rating, one load direction. The designation 294/600 EM separates into 294 (series), 600 mm (slash-size) (600 mm bore — bore 600 mm is written directly after the slash) and EM; washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. One direction only: 294/600 EM cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 600 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 13100 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 300 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 1030 mm washer track.",
      "Minimum load factor A 300 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 280 r/min reference speed is the thermal criterion under load, the 530 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/600 EM.",
      "The 13100/56000 kN ratings and 845000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 294/600 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 294/600 EM mounted?",
        "a": "Tight shaft washer on the 600 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 300 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 294/600 EM?",
        "a": "A 294/600 EM measures 600 mm bore × 1030 mm outside diameter × 258 mm width (23.622 × 40.551 × 10.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13100 kN, static C0 56000 kN, fatigue limit Pu 4000 kN, reference speed 280 r/min, limiting speed 530 r/min, mass about 845000 g. Minimum axial load factor A 300 must be maintained in service."
      },
      {
        "q": "How is the 294/600 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 600 mm (slash-size) the 600 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-600-EM",
      "294/600 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-630-EM",
    "brand": "SKF",
    "manufacturer_designation": "292/630 EM",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 630,
    "D_mm": 850,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4770,
    "static_load_kN": 23600,
    "fatigue_load_limit_kN": 1800,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "292/630 EM is the classic hook-block and screw-end thrust bearing: 630 mm shaft washer bore, 850 mm OD, minimum axial load factor A 53, and free rotation under load thanks to the spherical geometry. The designation 292/630 EM separates into 292 (series), 630 mm (slash-size) (630 mm bore — bore 630 mm is written directly after the slash) and EM; washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Minimum axial load is explicit at factor A 53: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: fit the shaft washer tight on the 630 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 4770 kN working load.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 630 mm bore and 210 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 4770/23600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 400 r/min reference speed is the thermal criterion under load, the 670 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "The 4770/23600 kN ratings and 210000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 292/630 EM designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 630 mm (slash-size) the 630 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 53) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 53 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 292/630 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 292/630 EM mounted?",
        "a": "Tight shaft washer on the 630 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 53 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-630-EM",
      "292/630 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "293-630-EM",
    "brand": "SKF",
    "manufacturer_designation": "293/630 EM",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 630,
    "D_mm": 950,
    "B_mm": 190,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 8450,
    "static_load_kN": 38000,
    "fatigue_load_limit_kN": 2900,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 600,
    "max_rpm": 600,
    "weight_g": 485000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 293/630 EM aligns itself: 630×950×190 mm envelope, 38000 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 293/630 EM is the machined brass EM cage. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. Selection arithmetic: C 8450 kN against C0 38000 kN gives a C0/C ratio of 4.50 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 630 mm bore and 485 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 293/630 EM.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 140 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 8450/38000 kN ratings and 485000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 293/630 EM is the medium 293 series, 630×950×190 mm."
      },
      {
        "q": "What do E, EM and EF mean on 293/630 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      },
      {
        "q": "Where is the 293/630 EM typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 140 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 600 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "293",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "293-630-EM",
      "293/630 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-630-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/630 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 630,
    "D_mm": 1090,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 14400,
    "static_load_kN": 62000,
    "fatigue_load_limit_kN": 4150,
    "reference_speed_rpm": 260,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "weight_g": 1040000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 294/630 EM aligns itself: 630×1090×280 mm envelope, 62000 kN static rating, one load direction. In 294/630 EM, the 294 series fixes the 1090 mm OD and 280 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 630 mm (slash-size) selects the 630 mm seat. A minimum axial load of factor A 370 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Static safety matters for shock duty: compare peak axial force against C0 62000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 630 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 14400 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 630 mm bore and 1040 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "the 260 r/min reference speed is the thermal criterion under load, the 500 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/630 EM.",
      "The 14400/62000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 370 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 14400/62000 kN ratings and 1040000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 294/630 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 630 mm (slash-size) the 630 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 370) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 370 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 294/630 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 294/630 EM mounted?",
        "a": "Tight shaft washer on the 630 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 370 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-630-EM",
      "294/630 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-670-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/670 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 670,
    "D_mm": 1150,
    "B_mm": 290,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 15400,
    "static_load_kN": 68000,
    "fatigue_load_limit_kN": 4500,
    "reference_speed_rpm": 240,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "weight_g": 1210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "294/670 EM is the classic hook-block and screw-end thrust bearing: 670 mm shaft washer bore, 1150 mm OD, minimum axial load factor A 440, and free rotation under load thanks to the spherical geometry. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 294/670 EM is the machined brass EM cage. A minimum axial load of factor A 440 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Selection arithmetic: C 15400 kN against C0 68000 kN gives a C0/C ratio of 4.42 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Verify the minimum axial load (factor A 440) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 670 mm bore and 1210 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/670 EM.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 440 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 15400/68000 kN ratings and 1210000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 440 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 450 r/min."
      },
      {
        "q": "Which dimensions does the 294/670 EM have?",
        "a": "A 294/670 EM measures 670 mm bore × 1150 mm outside diameter × 290 mm width (26.378 × 45.276 × 11.417 in). From SKF catalogue PUB BU/P1 17000: dynamic C 15400 kN, static C0 68000 kN, fatigue limit Pu 4500 kN, reference speed 240 r/min, limiting speed 450 r/min, mass about 1210000 g. Minimum axial load factor A 440 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 294/670 EM is the heavy 294 series, 670×1150×290 mm."
      },
      {
        "q": "What do E, EM and EF mean on 294/670 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-670-EM",
      "294/670 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "293-710-EM",
    "brand": "SKF",
    "manufacturer_designation": "293/710 EM",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 710,
    "D_mm": 1060,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9950,
    "static_load_kN": 45500,
    "fatigue_load_limit_kN": 3400,
    "reference_speed_rpm": 280,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "weight_g": 610000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 293/710 EM aligns itself: 710×1060×212 mm envelope, 45500 kN static rating, one load direction. The designation 293/710 EM separates into 293 (series), 710 mm (slash-size) (710 mm bore — bore 710 mm is written directly after the slash) and EM; washers are separable for individual mounting. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. The 610000 g mass and 212 mm axial height sit between 710 and 1060 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 200) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 710 mm bore and 610 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "the 280 r/min reference speed is the thermal criterion under load, the 500 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 293/710 EM.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 9950/45500 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 9950/45500 kN ratings and 610000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 200) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 200 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 293/710 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 293/710 EM mounted?",
        "a": "Tight shaft washer on the 710 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 200 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 293/710 EM?",
        "a": "A 293/710 EM measures 710 mm bore × 1060 mm outside diameter × 212 mm width (27.953 × 41.732 × 8.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9950 kN, static C0 45500 kN, fatigue limit Pu 3400 kN, reference speed 280 r/min, limiting speed 500 r/min, mass about 610000 g. Minimum axial load factor A 200 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "293",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "293-710-EM",
      "293/710 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-710-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/710 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 710,
    "D_mm": 1220,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17600,
    "static_load_kN": 76500,
    "fatigue_load_limit_kN": 5000,
    "reference_speed_rpm": 220,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "weight_g": 1500000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 294/710 EF aligns itself: 710×1220×308 mm envelope, 76500 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 294/710 EF is the extra-large steel EF cage. A minimum axial load of factor A 560 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Speed planning separates the 220 r/min thermal reference from the 430 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Verify the minimum axial load (factor A 560) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 710 mm bore and 1500 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/710 EF.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 220 r/min reference speed is the thermal criterion under load, the 430 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 17600/76500 kN ratings and 1500000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 294/710 EF typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 560 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 430 r/min."
      },
      {
        "q": "Which dimensions does the 294/710 EF have?",
        "a": "A 294/710 EF measures 710 mm bore × 1220 mm outside diameter × 308 mm width (27.953 × 48.031 × 12.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 17600 kN, static C0 76500 kN, fatigue limit Pu 5000 kN, reference speed 220 r/min, limiting speed 430 r/min, mass about 1500000 g. Minimum axial load factor A 560 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 294/710 EF is the heavy 294 series, 710×1220×308 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-710-EF",
      "294/710 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-750-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/750 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 750,
    "D_mm": 1280,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 18700,
    "static_load_kN": 85000,
    "fatigue_load_limit_kN": 5500,
    "reference_speed_rpm": 200,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "weight_g": 1650000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 294/750 EF denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the extra-large steel EF cage guides the rollers under 315 mm of axial section. Reading the code: 294 gives the dimension series (heavy 294 series) and 750 mm (slash-size) the 750 mm shaft washer bore (the bore is written directly after the slash (no bore code)); the EF sets the cage design. A minimum axial load of factor A 690 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 1650000 g mass and 315 mm axial height sit between 750 and 1280 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 750 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 18700 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 750 mm bore and 1650 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/750 EF.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 690 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 18700/85000 kN ratings and 1650000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 294/750 EF?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the extra-large steel EF cage."
      },
      {
        "q": "Where is the 294/750 EF typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 690 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 400 r/min."
      },
      {
        "q": "Which dimensions does the 294/750 EF have?",
        "a": "A 294/750 EF measures 750 mm bore × 1280 mm outside diameter × 315 mm width (29.528 × 50.394 × 12.402 in). From SKF catalogue PUB BU/P1 17000: dynamic C 18700 kN, static C0 85000 kN, fatigue limit Pu 5500 kN, reference speed 200 r/min, limiting speed 400 r/min, mass about 1650000 g. Minimum axial load factor A 690 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-750-EF",
      "294/750 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-800-EM",
    "brand": "SKF",
    "manufacturer_designation": "292/800 EM",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 800,
    "D_mm": 1060,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6560,
    "static_load_kN": 34500,
    "fatigue_load_limit_kN": 2550,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 530,
    "max_rpm": 530,
    "weight_g": 380000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "292/800 EM is the classic hook-block and screw-end thrust bearing: 800 mm shaft washer bore, 1060 mm OD, minimum axial load factor A 110, and free rotation under load thanks to the spherical geometry. Reading the code: 292 gives the dimension series (high-speed 292 series) and 800 mm (slash-size) the 800 mm shaft washer bore (the bore is written directly after the slash (no bore code)); the EM sets the cage design. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 292/800 EM cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 800 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 6560 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 800 mm bore and 380 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 320 r/min reference speed is the thermal criterion under load, the 530 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 110 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 292/800 EM.",
      "The 6560/34500 kN ratings and 380000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 292/800 EM typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 110 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 530 r/min."
      },
      {
        "q": "Which dimensions does the 292/800 EM have?",
        "a": "A 292/800 EM measures 800 mm bore × 1060 mm outside diameter × 155 mm width (31.496 × 41.732 × 6.102 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6560 kN, static C0 34500 kN, fatigue limit Pu 2550 kN, reference speed 320 r/min, limiting speed 530 r/min, mass about 380000 g. Minimum axial load factor A 110 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 292/800 EM is the high-speed 292 series, 800×1060×155 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-800-EM",
      "292/800 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "293-800-EM",
    "brand": "SKF",
    "manufacturer_designation": "293/800 EM",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 800,
    "D_mm": 1180,
    "B_mm": 230,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11300,
    "static_load_kN": 55000,
    "fatigue_load_limit_kN": 3900,
    "reference_speed_rpm": 240,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "weight_g": 810000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "293/800 EM is the classic hook-block and screw-end thrust bearing: 800 mm shaft washer bore, 1180 mm OD, minimum axial load factor A 290, and free rotation under load thanks to the spherical geometry. The designation 293/800 EM separates into 293 (series), 800 mm (slash-size) (800 mm bore — bore 800 mm is written directly after the slash) and EM; washers are separable for individual mounting. A minimum axial load of factor A 290 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 810000 g mass and 230 mm axial height sit between 800 and 1180 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 290) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 800 mm bore and 810 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Minimum load factor A 290 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 240 r/min reference speed is the thermal criterion under load, the 450 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 293/800 EM.",
      "The 11300/55000 kN ratings and 810000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 293/800 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 293/800 EM mounted?",
        "a": "Tight shaft washer on the 800 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 290 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 293/800 EM?",
        "a": "A 293/800 EM measures 800 mm bore × 1180 mm outside diameter × 230 mm width (31.496 × 46.457 × 9.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11300 kN, static C0 55000 kN, fatigue limit Pu 3900 kN, reference speed 240 r/min, limiting speed 450 r/min, mass about 810000 g. Minimum axial load factor A 290 must be maintained in service."
      },
      {
        "q": "How is the 293/800 EM designation read?",
        "a": "293 is the dimension series (medium 293 series) and 800 mm (slash-size) the 800 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "293",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "293-800-EM",
      "293/800 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-800-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/800 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 800,
    "D_mm": 1360,
    "B_mm": 335,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 20200,
    "static_load_kN": 93000,
    "fatigue_load_limit_kN": 5850,
    "reference_speed_rpm": 190,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "weight_g": 2030000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "294/800 EF is the classic hook-block and screw-end thrust bearing: 800 mm shaft washer bore, 1360 mm OD, minimum axial load factor A 820, and free rotation under load thanks to the spherical geometry. The designation 294/800 EF separates into 294 (series), 800 mm (slash-size) (800 mm bore — bore 800 mm is written directly after the slash) and EF; washers are separable for individual mounting. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Speed planning separates the 190 r/min thermal reference from the 360 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: fit the shaft washer tight on the 800 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 20200 kN working load.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 800 mm bore and 2030 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Minimum load factor A 820 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 20200/93000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 20200/93000 kN ratings and 2030000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 294/800 EF?",
        "a": "A 294/800 EF measures 800 mm bore × 1360 mm outside diameter × 335 mm width (31.496 × 53.543 × 13.189 in). From SKF catalogue PUB BU/P1 17000: dynamic C 20200 kN, static C0 93000 kN, fatigue limit Pu 5850 kN, reference speed 190 r/min, limiting speed 360 r/min, mass about 2030000 g. Minimum axial load factor A 820 must be maintained in service."
      },
      {
        "q": "How is the 294/800 EF designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 800 mm (slash-size) the 800 mm bore (the bore is written directly after the slash (no bore code)); EF is the cage execution (extra-large steel EF cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 820) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 820 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 294/800 EF also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-800-EF",
      "294/800 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-850-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/850 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 850,
    "D_mm": 1440,
    "B_mm": 354,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 23900,
    "static_load_kN": 108000,
    "fatigue_load_limit_kN": 7100,
    "reference_speed_rpm": 170,
    "limiting_speed_rpm": 340,
    "max_rpm": 340,
    "weight_g": 2390000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "294/850 EF is a spherical roller thrust bearing to ISO 104 in the heavy 294 series: asymmetrical barrel rollers running on a sphered housing washer, sized 850×1440×354 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. Reading the code: 294 gives the dimension series (heavy 294 series) and 850 mm (slash-size) the 850 mm shaft washer bore (the bore is written directly after the slash (no bore code)); the EF sets the cage design. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Selection arithmetic: C 23900 kN against C0 108000 kN gives a C0/C ratio of 4.52 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the extra-large steel EF cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 850 mm bore and 2390 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "The 23900/108000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1100 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 23900/108000 kN ratings and 2390000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1100 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 340 r/min."
      },
      {
        "q": "Which dimensions does the 294/850 EF have?",
        "a": "A 294/850 EF measures 850 mm bore × 1440 mm outside diameter × 354 mm width (33.465 × 56.693 × 13.937 in). From SKF catalogue PUB BU/P1 17000: dynamic C 23900 kN, static C0 108000 kN, fatigue limit Pu 7100 kN, reference speed 170 r/min, limiting speed 340 r/min, mass about 2390000 g. Minimum axial load factor A 1100 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 294/850 EF is the heavy 294 series, 850×1440×354 mm."
      },
      {
        "q": "What do E, EM and EF mean on 294/850 EF?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the extra-large steel EF cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-850-EF",
      "294/850 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-900-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/900 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 900,
    "D_mm": 1520,
    "B_mm": 372,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 26700,
    "static_load_kN": 122000,
    "fatigue_load_limit_kN": 7200,
    "reference_speed_rpm": 160,
    "limiting_speed_rpm": 300,
    "max_rpm": 300,
    "weight_g": 2650000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 294/900 EF for very heavy one-direction axial load: 26700 kN dynamic and 122000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 294/900 EF is the extra-large steel EF cage. A minimum axial load of factor A 1400 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. One direction only: 294/900 EF cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the extra-large steel EF cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 900 mm bore and 2650 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/900 EF.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 26700/122000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1400 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 26700/122000 kN ratings and 2650000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 294/900 EF?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the extra-large steel EF cage."
      },
      {
        "q": "Where is the 294/900 EF typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1400 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 300 r/min."
      },
      {
        "q": "Which dimensions does the 294/900 EF have?",
        "a": "A 294/900 EF measures 900 mm bore × 1520 mm outside diameter × 372 mm width (35.433 × 59.843 × 14.646 in). From SKF catalogue PUB BU/P1 17000: dynamic C 26700 kN, static C0 122000 kN, fatigue limit Pu 7200 kN, reference speed 160 r/min, limiting speed 300 r/min, mass about 2650000 g. Minimum axial load factor A 1400 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-900-EF",
      "294/900 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-950-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/950 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 950,
    "D_mm": 1600,
    "B_mm": 390,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 28200,
    "static_load_kN": 132000,
    "fatigue_load_limit_kN": 7800,
    "reference_speed_rpm": 140,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "weight_g": 3070000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 294/950 EF denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the extra-large steel EF cage guides the rollers under 390 mm of axial section. The designation 294/950 EF separates into 294 (series), 950 mm (slash-size) (950 mm bore — bore 950 mm is written directly after the slash) and EF; washers are separable for individual mounting. A minimum axial load of factor A 1700 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Static safety matters for shock duty: compare peak axial force against C0 132000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 1700) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 950 mm bore and 3070 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "the 140 r/min reference speed is the thermal criterion under load, the 280 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/950 EF.",
      "The 28200/132000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1700 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 28200/132000 kN ratings and 3070000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 294/950 EF designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 950 mm (slash-size) the 950 mm bore (the bore is written directly after the slash (no bore code)); EF is the cage execution (extra-large steel EF cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 1700) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 1700 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 294/950 EF also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 294/950 EF mounted?",
        "a": "Tight shaft washer on the 950 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 1700 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-950-EF",
      "294/950 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-1000-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/1000 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 1000,
    "D_mm": 1670,
    "B_mm": 402,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 31100,
    "static_load_kN": 140000,
    "fatigue_load_limit_kN": 8650,
    "reference_speed_rpm": 130,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "weight_g": 3390000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "294/1000 EF is a spherical roller thrust bearing to ISO 104 in the heavy 294 series: asymmetrical barrel rollers running on a sphered housing washer, sized 1000×1670×402 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 294/1000 EF is the extra-large steel EF cage. A minimum axial load of factor A 1900 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Minimum axial load is explicit at factor A 1900: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the extra-large steel EF cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 1000 mm bore and 3390 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 130 r/min reference speed is the thermal criterion under load, the 260 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 31100/140000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 31100/140000 kN ratings and 3390000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1900 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 260 r/min."
      },
      {
        "q": "Which dimensions does the 294/1000 EF have?",
        "a": "A 294/1000 EF measures 1000 mm bore × 1670 mm outside diameter × 402 mm width (39.37 × 65.748 × 15.827 in). From SKF catalogue PUB BU/P1 17000: dynamic C 31100 kN, static C0 140000 kN, fatigue limit Pu 8650 kN, reference speed 130 r/min, limiting speed 260 r/min, mass about 3390000 g. Minimum axial load factor A 1900 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 294/1000 EF is the heavy 294 series, 1000×1670×402 mm."
      },
      {
        "q": "What do E, EM and EF mean on 294/1000 EF?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the extra-large steel EF cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-1000-EF",
      "294/1000 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-1060-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/1060 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 1060,
    "D_mm": 1770,
    "B_mm": 426,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 33400,
    "static_load_kN": 156000,
    "fatigue_load_limit_kN": 8500,
    "reference_speed_rpm": 120,
    "limiting_speed_rpm": 240,
    "max_rpm": 240,
    "weight_g": 4280000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 294/1060 EF for very heavy one-direction axial load: 33400 kN dynamic and 156000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 294/1060 EF is the extra-large steel EF cage. The extra-large steel EF cage is matched to size: the EF steel cage is built for the extra-large sizes where a pressed cage would deform. The sphered housing washer self-aligns during mounting and under shaft deflection. Selection arithmetic: C 33400 kN against C0 156000 kN gives a C0/C ratio of 4.67 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: fit the shaft washer tight on the 1060 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 33400 kN working load.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 1060 mm bore and 4280 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "The 33400/156000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 2300 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 33400/156000 kN ratings and 4280000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 294/1060 EF have?",
        "a": "A 294/1060 EF measures 1060 mm bore × 1770 mm outside diameter × 426 mm width (41.732 × 69.685 × 16.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 33400 kN, static C0 156000 kN, fatigue limit Pu 8500 kN, reference speed 120 r/min, limiting speed 240 r/min, mass about 4280000 g. Minimum axial load factor A 2300 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 294/1060 EF is the heavy 294 series, 1060×1770×426 mm."
      },
      {
        "q": "What do E, EM and EF mean on 294/1060 EF?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the extra-large steel EF cage."
      },
      {
        "q": "Where is the 294/1060 EF typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-1060-EF",
      "294/1060 EF"
    ],
    "locale_variants": {}
  }
]