[ { "sku": "C6006-V", "brand": "SKF", "manufacturer_designation": "C 6006 V", "series": "C6000-series", "type": "carb_toroidal", "d_mm": 30, "D_mm": 55, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 134, "static_load_kN": 180, "fatigue_load_limit_kN": 21.2, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 6006 V: the toroidal rollers allow the 30 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (60) identify the ISO dimension series and the last two (06) encode the 30 mm bore; suffixes describe bore and execution. The cylindrical 30 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 30×55×45 mm are identical — only the mounting method changes. The 490 g mass over the 30×55×45 mm envelope yields about 4.47 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 45 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 30 mm bore the small CARB executions are unusually wide (45 mm) for their 55 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 30 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 6006 V must float; the two are designed to be used as a pair.", "The 134/180 kN ratings and 490 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 6006 V have?", "a": "A C 6006 V measures 30 mm bore × 55 mm outside diameter × 45 mm width (1.181 × 2.165 × 1.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 134 kN, static C0 180 kN, fatigue limit Pu 21.2 kN, limiting speed 3,200 r/min, no reference speed listed, mass about 490 g." }, { "q": "What does C 6006 V mean in SKF part numbering?", "a": "C marks CARB; 60 the dimension series; the size code gives 30 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 6006 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 6006 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C6006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C6006-V", "C 6006 V" ], "locale_variants": {} }, { "sku": "C2206-TN9", "brand": "SKF", "manufacturer_designation": "C 2206 TN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 69.5, "static_load_kN": 62, "fatigue_load_limit_kN": 7.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2206 TN9 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 30 mm bore, 62 mm outside diameter, 20 mm wide unit rated 69.5 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (06) encode the 30 mm bore; suffixes describe bore and execution. The TN9 suffix marks a glass fibre reinforced PA66 cage: lower friction and quieter than the full-complement V execution, with a 11,000 r/min reference speed, the usual choice for continuous-duty fans and paper rolls. The 280 g mass over the 30×62×20 mm envelope yields about 2.32 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 30 mm seat or heat it (max 120 °C) and seat it square; never press through the 20 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 30 mm bore the small CARB executions are unusually wide (20 mm) for their 62 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2206 TN9 must float; the two are designed to be used as a pair.", "Never use C 2206 TN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 30 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 11,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 69.5/62 kN ratings and 280 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 2206 TN9 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 30 mm bore; TN9 is the execution (cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2206 TN9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2206 TN9 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C2206-KTN9", "equiv_brand": "SKF", "level": "full", "note": "Same 30×62×20 mm ISO 15 envelope and equivalent catalogue C/C0; C 2206 KTN9 is the 1:12 tapered-bore K TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2206-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and cylindrical-bore full-complement V executions (69.5/62 kN vs 76.5/71 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22206", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (30×62×20 mm) SKF spherical roller bearing SKF 22206 E with ratings within 10 % — not a drop-in substitute: SKF 22206 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22206-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (30×62×20 mm) SKF spherical roller bearing SKF 22206 EK with ratings within 10 % — not a drop-in substitute: SKF 22206 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2206-TN9", "C 2206 TN9" ], "locale_variants": {} }, { "sku": "C2206-KTN9", "brand": "SKF", "manufacturer_designation": "C 2206 KTN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 69.5, "static_load_kN": 62, "fatigue_load_limit_kN": 7.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2206 KTN9 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 30 mm bore, 62 mm outside diameter, 20 mm wide unit rated 69.5 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (06) encode the 30 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 30 mm shaft deflects; the 11,000 r/min reference and 15,000 r/min limiting speed are both catalogue values. Speed planning separates the 11,000 r/min thermal reference from the 15,000 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the TN9-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 62 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 30 mm bore the small CARB executions are unusually wide (20 mm) for their 62 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 69.5/62 kN ratings belong to this exact execution (C 2206 KTN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 30 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 11,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 69.5/62 kN ratings and 280 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2206 KTN9 have?", "a": "A C 2206 KTN9 measures 30 mm bore × 62 mm outside diameter × 20 mm width (1.181 × 2.441 × 0.787 in). From SKF catalogue PUB BU/P1 17000: dynamic C 69.5 kN, static C0 62 kN, fatigue limit Pu 7.2 kN, reference speed 11,000 r/min, limiting speed 15,000 r/min, mass about 280 g." }, { "q": "What does C 2206 KTN9 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 30 mm bore; KTN9 is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2206 KTN9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C2206-TN9", "equiv_brand": "SKF", "level": "full", "note": "Same 30×62×20 mm ISO 15 envelope and equivalent catalogue C/C0; C 2206 TN9 is the cylindrical-bore TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2206-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and cylindrical-bore full-complement V executions (69.5/62 kN vs 76.5/71 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22206", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (30×62×20 mm) SKF spherical roller bearing SKF 22206 E with ratings within 10 % — not a drop-in substitute: SKF 22206 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22206-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (30×62×20 mm) SKF spherical roller bearing SKF 22206 EK with ratings within 10 % — not a drop-in substitute: SKF 22206 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2206-KTN9", "C 2206 KTN9" ], "locale_variants": {} }, { "sku": "C2206-V", "brand": "SKF", "manufacturer_designation": "C 2206 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 76.5, "static_load_kN": 71, "fatigue_load_limit_kN": 8.3, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 290, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2206 V is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 30×62×20 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 2206 V the 22 dimension series fixes the 62 mm OD and 20 mm width around the 30 mm bore (code 06 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 30 mm seat. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 6,000 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 30 mm seat or heat it (max 120 °C) and seat it square; never press through the 20 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 30 mm bore the small CARB executions are unusually wide (20 mm) for their 62 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Never use C 2206 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 30 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The quoted 76.5/71 kN ratings belong to this exact execution (C 2206 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 76.5/71 kN ratings and 290 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (76.5 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2206 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 2206 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 30 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 20 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2206 V?", "a": "A C 2206 V measures 30 mm bore × 62 mm outside diameter × 20 mm width (1.181 × 2.441 × 0.787 in). From SKF catalogue PUB BU/P1 17000: dynamic C 76.5 kN, static C0 71 kN, fatigue limit Pu 8.3 kN, limiting speed 6,000 r/min, no reference speed listed, mass about 290 g." }, { "q": "Can a CARB bearing like C 2206 V locate the shaft axially?", "a": "No — that is the defining feature. C 2206 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C2206-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore TN9 PA66-caged executions (76.5/71 kN vs 69.5/62 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2206-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (76.5/71 kN vs 69.5/62 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22206", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×20 mm envelope as the SKF spherical roller bearing SKF 22206 E, but catalogue C/C0 differ (76.5/71 kN vs 66.1/60 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22206-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×20 mm envelope as the SKF spherical roller bearing SKF 22206 EK, but catalogue C/C0 differ (76.5/71 kN vs 66.1/60 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2206-V", "C 2206 V" ], "locale_variants": {} }, { "sku": "C2207-TN9", "brand": "SKF", "manufacturer_designation": "C 2207 TN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 83, "static_load_kN": 80, "fatigue_load_limit_kN": 9.3, "reference_speed_rpm": 9500, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2207 TN9 belongs to the CARB family — compact aligning roller bearings: envelope 35×72×23 mm, radial rating 83/80 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (07) encode the 35 mm bore; suffixes describe bore and execution. The cylindrical 35 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 35×72×23 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2207 TN9 deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 23 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 35 mm bore the small CARB executions are unusually wide (23 mm) for their 72 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 83/80 kN ratings belong to this exact execution (C 2207 TN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 2207 TN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 35 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 83/80 kN ratings and 440 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 2207 TN9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2207 TN9 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2207 TN9 have?", "a": "A C 2207 TN9 measures 35 mm bore × 72 mm outside diameter × 23 mm width (1.378 × 2.835 × 0.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 83 kN, static C0 80 kN, fatigue limit Pu 9.3 kN, reference speed 9,500 r/min, limiting speed 13,000 r/min, mass about 440 g." } ], "cross_ref": [ { "equiv_sku": "C2207-KTN9", "equiv_brand": "SKF", "level": "full", "note": "Same 35×72×23 mm ISO 15 envelope and equivalent catalogue C/C0; C 2207 KTN9 is the 1:12 tapered-bore K TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2207-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and cylindrical-bore full-complement V executions (83/80 kN vs 95/96 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22207", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (35×72×23 mm) SKF spherical roller bearing SKF 22207 E with ratings within 10 % — not a drop-in substitute: SKF 22207 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22207-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (35×72×23 mm) SKF spherical roller bearing SKF 22207 EK with ratings within 10 % — not a drop-in substitute: SKF 22207 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2207-TN9", "C 2207 TN9" ], "locale_variants": {} }, { "sku": "C2207-KTN9", "brand": "SKF", "manufacturer_designation": "C 2207 KTN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 83, "static_load_kN": 80, "fatigue_load_limit_kN": 9.3, "reference_speed_rpm": 9500, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2207 KTN9 is the dimension series 22 CARB toroidal roller bearings member of the CARB range: 35 mm bore, 72 mm OD, 23 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 2207 KTN9 separates into C (CARB), 22 (dimension series), 07 (35 mm bore) and KTN9 (tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage); envelope 35×72×23 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 35 mm seat. Selection arithmetic: C 83 kN against C0 80 kN gives a C0/C ratio of 0.96, and the 9.3 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 72 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 35 mm bore the small CARB executions are unusually wide (23 mm) for their 72 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Never use C 2207 KTN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 35 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The quoted 83/80 kN ratings belong to this exact execution (C 2207 KTN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 83/80 kN ratings and 440 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 2207 KTN9 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 07 = 35 mm bore (code 07 × 5); suffix KTN9 selects tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (83 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2207 KTN9 is the tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage." }, { "q": "How is C 2207 KTN9 mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2207 KTN9?", "a": "A C 2207 KTN9 measures 35 mm bore × 72 mm outside diameter × 23 mm width (1.378 × 2.835 × 0.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 83 kN, static C0 80 kN, fatigue limit Pu 9.3 kN, reference speed 9,500 r/min, limiting speed 13,000 r/min, mass about 440 g." } ], "cross_ref": [ { "equiv_sku": "C2207-TN9", "equiv_brand": "SKF", "level": "full", "note": "Same 35×72×23 mm ISO 15 envelope and equivalent catalogue C/C0; C 2207 TN9 is the cylindrical-bore TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2207-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and cylindrical-bore full-complement V executions (83/80 kN vs 95/96 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22207", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (35×72×23 mm) SKF spherical roller bearing SKF 22207 E with ratings within 10 % — not a drop-in substitute: SKF 22207 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22207-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (35×72×23 mm) SKF spherical roller bearing SKF 22207 EK with ratings within 10 % — not a drop-in substitute: SKF 22207 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2207-KTN9", "C 2207 KTN9" ], "locale_variants": {} }, { "sku": "C2207-V", "brand": "SKF", "manufacturer_designation": "C 2207 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 95, "static_load_kN": 96, "fatigue_load_limit_kN": 11.2, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2207 V belongs to the CARB family — compact aligning roller bearings: envelope 35×72×23 mm, radial rating 95/96 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 2207 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The cylindrical 35 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 35×72×23 mm are identical — only the mounting method changes. The 460 g mass over the 35×72×23 mm envelope yields about 2.71 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 35 mm seat or heat it (max 120 °C) and seat it square; never press through the 23 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 35 mm bore the small CARB executions are unusually wide (23 mm) for their 72 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2207 V must float; the two are designed to be used as a pair.", "Never use C 2207 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 95/96 kN ratings belong to this exact execution (C 2207 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 95/96 kN ratings and 460 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 2207 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2207 V have?", "a": "A C 2207 V measures 35 mm bore × 72 mm outside diameter × 23 mm width (1.378 × 2.835 × 0.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 95 kN, static C0 96 kN, fatigue limit Pu 11.2 kN, limiting speed 5,300 r/min, no reference speed listed, mass about 460 g." }, { "q": "What does C 2207 V mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 35 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C2207-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore TN9 PA66-caged executions (95/96 kN vs 83/80 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2207-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (95/96 kN vs 83/80 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22207", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×23 mm envelope as the SKF spherical roller bearing SKF 22207 E, but catalogue C/C0 differ (95/96 kN vs 88.8/85 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22207-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×23 mm envelope as the SKF spherical roller bearing SKF 22207 EK, but catalogue C/C0 differ (95/96 kN vs 88.8/85 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2207-V", "C 2207 V" ], "locale_variants": {} }, { "sku": "C4908-V", "brand": "SKF", "manufacturer_designation": "C 4908 V", "series": "C4900-series", "type": "carb_toroidal", "d_mm": 40, "D_mm": 62, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 76.5, "static_load_kN": 100, "fatigue_load_limit_kN": 11.8, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 4908 V combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 40 mm bore, 62 mm outside diameter, 22 mm wide unit rated 76.5 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 4908 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 40 mm shaft deflects; no reference speed is listed and the limiting speed is 4,300 r/min. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 4,300 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 22 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 40 mm bore the small CARB executions are unusually wide (22 mm) for their 62 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4908 V must float; the two are designed to be used as a pair.", "Never use C 4908 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 40 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 76.5/100 kN ratings and 250 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4908 V have?", "a": "A C 4908 V measures 40 mm bore × 62 mm outside diameter × 22 mm width (1.575 × 2.441 × 0.866 in). From SKF catalogue PUB BU/P1 17000: dynamic C 76.5 kN, static C0 100 kN, fatigue limit Pu 11.8 kN, limiting speed 4,300 r/min, no reference speed listed, mass about 250 g." }, { "q": "What does C 4908 V mean in SKF part numbering?", "a": "C marks CARB; 49 the dimension series; the size code gives 40 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4908 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C4908", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4908-V", "C 4908 V" ], "locale_variants": {} }, { "sku": "C2208-TN9", "brand": "SKF", "manufacturer_designation": "C 2208 TN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 90, "static_load_kN": 86.5, "fatigue_load_limit_kN": 10.2, "reference_speed_rpm": 8000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 510, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2208 TN9 belongs to the CARB family — compact aligning roller bearings: envelope 40×80×23 mm, radial rating 90/86.5 kN C/C0, and no axial-locating function by design. The designation C 2208 TN9 separates into C (CARB), 22 (dimension series), 08 (40 mm bore) and TN9 (cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage); envelope 40×80×23 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 40 mm shaft deflects; the 8,000 r/min reference and 11,000 r/min limiting speed are both catalogue values. The 510 g mass over the 40×80×23 mm envelope yields about 2.25 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 40 mm seat or heat it (max 120 °C) and seat it square; never press through the 23 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 40 mm bore the small CARB executions are unusually wide (23 mm) for their 80 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the 8,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 90/86.5 kN ratings belong to this exact execution (C 2208 TN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2208 TN9 must float; the two are designed to be used as a pair.", "Never use C 2208 TN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 90/86.5 kN ratings and 510 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (90 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2208 TN9 is the cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage." }, { "q": "How is C 2208 TN9 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 40 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 23 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2208 TN9?", "a": "A C 2208 TN9 measures 40 mm bore × 80 mm outside diameter × 23 mm width (1.575 × 3.15 × 0.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 90 kN, static C0 86.5 kN, fatigue limit Pu 10.2 kN, reference speed 8,000 r/min, limiting speed 11,000 r/min, mass about 510 g." }, { "q": "Can a CARB bearing like C 2208 TN9 locate the shaft axially?", "a": "No — that is the defining feature. C 2208 TN9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C2208-KTN9", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×23 mm ISO 15 envelope and equivalent catalogue C/C0; C 2208 KTN9 is the 1:12 tapered-bore K TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2208-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and cylindrical-bore full-complement V executions (90/86.5 kN vs 102/104 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22208", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (40×80×23 mm) SKF spherical roller bearing SKF 22208 E with ratings within 10 % — not a drop-in substitute: SKF 22208 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22208-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (40×80×23 mm) SKF spherical roller bearing SKF 22208 EK with ratings within 10 % — not a drop-in substitute: SKF 22208 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2208-TN9", "C 2208 TN9" ], "locale_variants": {} }, { "sku": "C2208-KTN9", "brand": "SKF", "manufacturer_designation": "C 2208 KTN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 90, "static_load_kN": 86.5, "fatigue_load_limit_kN": 10.2, "reference_speed_rpm": 8000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 510, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2208 KTN9: the toroidal rollers allow the 40 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 2208 KTN9 separates into C (CARB), 22 (dimension series), 08 (40 mm bore) and KTN9 (tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage); envelope 40×80×23 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 40 mm shaft deflects; the 8,000 r/min reference and 11,000 r/min limiting speed are both catalogue values. The 510 g mass over the 40×80×23 mm envelope yields about 2.25 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 23 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 40 mm bore the small CARB executions are unusually wide (23 mm) for their 80 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the 8,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 90/86.5 kN ratings belong to this exact execution (C 2208 KTN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2208 KTN9 must float; the two are designed to be used as a pair.", "The 90/86.5 kN ratings and 510 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2208 KTN9 mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2208 KTN9?", "a": "A C 2208 KTN9 measures 40 mm bore × 80 mm outside diameter × 23 mm width (1.575 × 3.15 × 0.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 90 kN, static C0 86.5 kN, fatigue limit Pu 10.2 kN, reference speed 8,000 r/min, limiting speed 11,000 r/min, mass about 510 g." }, { "q": "Can a CARB bearing like C 2208 KTN9 locate the shaft axially?", "a": "No — that is the defining feature. C 2208 KTN9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2208 KTN9 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 08 = 40 mm bore (code 08 × 5); suffix KTN9 selects tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2208-TN9", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×23 mm ISO 15 envelope and equivalent catalogue C/C0; C 2208 TN9 is the cylindrical-bore TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2208-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and cylindrical-bore full-complement V executions (90/86.5 kN vs 102/104 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22208", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (40×80×23 mm) SKF spherical roller bearing SKF 22208 E with ratings within 10 % — not a drop-in substitute: SKF 22208 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22208-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (40×80×23 mm) SKF spherical roller bearing SKF 22208 EK with ratings within 10 % — not a drop-in substitute: SKF 22208 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2208-KTN9", "C 2208 KTN9" ], "locale_variants": {} }, { "sku": "C2208-V", "brand": "SKF", "manufacturer_designation": "C 2208 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 102, "static_load_kN": 104, "fatigue_load_limit_kN": 12.2, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 530, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 2208 V in the dimension series 22 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. The designation C 2208 V separates into C (CARB), 22 (dimension series), 08 (40 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 40×80×23 mm follows the ISO 15 plan. The cylindrical 40 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 40×80×23 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2208 V deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 40 mm bore the small CARB executions are unusually wide (23 mm) for their 80 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2208 V must float; the two are designed to be used as a pair.", "Never use C 2208 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 40 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 102/104 kN ratings and 530 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2208 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 40 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 23 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2208 V?", "a": "A C 2208 V measures 40 mm bore × 80 mm outside diameter × 23 mm width (1.575 × 3.15 × 0.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 102 kN, static C0 104 kN, fatigue limit Pu 12.2 kN, limiting speed 4,500 r/min, no reference speed listed, mass about 530 g." }, { "q": "Can a CARB bearing like C 2208 V locate the shaft axially?", "a": "No — that is the defining feature. C 2208 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2208 V designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 08 = 40 mm bore (code 08 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2208-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore TN9 PA66-caged executions (102/104 kN vs 90/86.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2208-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (102/104 kN vs 90/86.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope as the SKF spherical roller bearing SKF 22208 E, but catalogue C/C0 differ (102/104 kN vs 98.5/90 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22208-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope as the SKF spherical roller bearing SKF 22208 EK, but catalogue C/C0 differ (102/104 kN vs 98.5/90 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2208-V", "C 2208 V" ], "locale_variants": {} }, { "sku": "C6909-V", "brand": "SKF", "manufacturer_designation": "C 6909 V", "series": "C6900-series", "type": "carb_toroidal", "d_mm": 45, "D_mm": 68, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 132, "static_load_kN": 200, "fatigue_load_limit_kN": 23.6, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 530, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 6909 V is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 45×68×40 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 6909 V separates into C (CARB), 69 (dimension series), 09 (45 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 45×68×40 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 45 mm shaft deflects; no reference speed is listed and the limiting speed is 2,600 r/min. The 530 g mass over the 45×68×40 mm envelope yields about 2.93 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 68 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 45 mm bore the small CARB executions are unusually wide (40 mm) for their 68 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 132/200 kN ratings belong to this exact execution (C 6909 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 45 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Never use C 6909 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 132/200 kN ratings and 530 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 6909 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 45 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 40 mm roller set." }, { "q": "What are the dimensions and ratings of the C 6909 V?", "a": "A C 6909 V measures 45 mm bore × 68 mm outside diameter × 40 mm width (1.772 × 2.677 × 1.575 in). From SKF catalogue PUB BU/P1 17000: dynamic C 132 kN, static C0 200 kN, fatigue limit Pu 23.6 kN, limiting speed 2,600 r/min, no reference speed listed, mass about 530 g." }, { "q": "Can a CARB bearing like C 6909 V locate the shaft axially?", "a": "No — that is the defining feature. C 6909 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 6909 V designation read?", "a": "C = CARB toroidal family; 69 = dimension series; 09 = 45 mm bore (code 09 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C6909", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C6909-V", "C 6909 V" ], "locale_variants": {} }, { "sku": "C2209-TN9", "brand": "SKF", "manufacturer_designation": "C 2209 TN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 93, "static_load_kN": 93, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2209 TN9 is the dimension series 22 CARB toroidal roller bearings member of the CARB range: 45 mm bore, 85 mm OD, 23 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 2209 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here TN9. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 45 mm shaft deflects; the 7,500 r/min reference and 11,000 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2209 TN9 deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 85 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 45 mm bore the small CARB executions are unusually wide (23 mm) for their 85 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 45 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 7,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 93/93 kN ratings belong to this exact execution (C 2209 TN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 93/93 kN ratings and 560 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 2209 TN9 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2209 TN9 have?", "a": "A C 2209 TN9 measures 45 mm bore × 85 mm outside diameter × 23 mm width (1.772 × 3.346 × 0.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 93 kN, static C0 93 kN, fatigue limit Pu 10.8 kN, reference speed 7,500 r/min, limiting speed 11,000 r/min, mass about 560 g." }, { "q": "What does C 2209 TN9 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 45 mm bore; TN9 is the execution (cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C2209-KTN9", "equiv_brand": "SKF", "level": "full", "note": "Same 45×85×23 mm ISO 15 envelope and equivalent catalogue C/C0; C 2209 KTN9 is the 1:12 tapered-bore K TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2209-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and cylindrical-bore full-complement V executions (93/93 kN vs 106/110 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope as the SKF spherical roller bearing SKF 22209 E, but catalogue C/C0 differ (93/93 kN vs 104/98 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22209-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope as the SKF spherical roller bearing SKF 22209 EK, but catalogue C/C0 differ (93/93 kN vs 104/98 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2209-TN9", "C 2209 TN9" ], "locale_variants": {} }, { "sku": "C2209-KTN9", "brand": "SKF", "manufacturer_designation": "C 2209 KTN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 93, "static_load_kN": 93, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2209 KTN9 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 45 mm bore, 85 mm outside diameter, 23 mm wide unit rated 93 kN dynamic. The designation C 2209 KTN9 separates into C (CARB), 22 (dimension series), 09 (45 mm bore) and KTN9 (tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage); envelope 45×85×23 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 45 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 45×85×23 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2209 KTN9 deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 85 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 45 mm bore the small CARB executions are unusually wide (23 mm) for their 85 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2209 KTN9 must float; the two are designed to be used as a pair.", "Never use C 2209 KTN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 45 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 93/93 kN ratings and 560 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 2209 KTN9 locate the shaft axially?", "a": "No — that is the defining feature. C 2209 KTN9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2209 KTN9 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 09 = 45 mm bore (code 09 × 5); suffix KTN9 selects tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (93 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2209 KTN9 is the tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage." }, { "q": "How is C 2209 KTN9 mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." } ], "cross_ref": [ { "equiv_sku": "C2209-TN9", "equiv_brand": "SKF", "level": "full", "note": "Same 45×85×23 mm ISO 15 envelope and equivalent catalogue C/C0; C 2209 TN9 is the cylindrical-bore TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2209-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and cylindrical-bore full-complement V executions (93/93 kN vs 106/110 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope as the SKF spherical roller bearing SKF 22209 E, but catalogue C/C0 differ (93/93 kN vs 104/98 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22209-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope as the SKF spherical roller bearing SKF 22209 EK, but catalogue C/C0 differ (93/93 kN vs 104/98 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2209-KTN9", "C 2209 KTN9" ], "locale_variants": {} }, { "sku": "C2209-V", "brand": "SKF", "manufacturer_designation": "C 2209 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 106, "static_load_kN": 110, "fatigue_load_limit_kN": 12.9, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2209 V: the toroidal rollers allow the 45 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 2209 V the 22 dimension series fixes the 85 mm OD and 23 mm width around the 45 mm bore (code 09 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The V suffix denotes a full complement: the toroidal rollers fill the 23 mm space without a cage, raising C to 106 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2209 V deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 45 mm bore the small CARB executions are unusually wide (23 mm) for their 85 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 106/110 kN ratings belong to this exact execution (C 2209 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2209 V must float; the two are designed to be used as a pair.", "The 106/110 kN ratings and 580 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2209 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 45 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 23 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2209 V?", "a": "A C 2209 V measures 45 mm bore × 85 mm outside diameter × 23 mm width (1.772 × 3.346 × 0.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 106 kN, static C0 110 kN, fatigue limit Pu 12.9 kN, limiting speed 4,300 r/min, no reference speed listed, mass about 580 g." }, { "q": "Can a CARB bearing like C 2209 V locate the shaft axially?", "a": "No — that is the defining feature. C 2209 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2209 V designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 09 = 45 mm bore (code 09 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2209-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore TN9 PA66-caged executions (106/110 kN vs 93/93 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2209-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (106/110 kN vs 93/93 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope as the SKF spherical roller bearing SKF 22209 E, but catalogue C/C0 differ (106/110 kN vs 104/98 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22209-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope as the SKF spherical roller bearing SKF 22209 EK, but catalogue C/C0 differ (106/110 kN vs 104/98 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2209-V", "C 2209 V" ], "locale_variants": {} }, { "sku": "C4910-V", "brand": "SKF", "manufacturer_designation": "C 4910 V", "series": "C4900-series", "type": "carb_toroidal", "d_mm": 50, "D_mm": 72, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 86.5, "static_load_kN": 125, "fatigue_load_limit_kN": 14.6, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 290, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 4910 V in the dimension series 49 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 4910 V the 49 dimension series fixes the 72 mm OD and 22 mm width around the 50 mm bore (code 10 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The cylindrical 50 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 50×72×22 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 22 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 50 mm seat or heat it (max 120 °C) and seat it square; never press through the 22 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 50 mm bore the small CARB executions are unusually wide (22 mm) for their 72 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4910 V must float; the two are designed to be used as a pair.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 50 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 86.5/125 kN ratings and 290 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (86.5 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4910 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 4910 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 50 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 22 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4910 V?", "a": "A C 4910 V measures 50 mm bore × 72 mm outside diameter × 22 mm width (1.969 × 2.835 × 0.866 in). From SKF catalogue PUB BU/P1 17000: dynamic C 86.5 kN, static C0 125 kN, fatigue limit Pu 14.6 kN, limiting speed 3,600 r/min, no reference speed listed, mass about 290 g." }, { "q": "Can a CARB bearing like C 4910 V locate the shaft axially?", "a": "No — that is the defining feature. C 4910 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C4910", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4910-V", "C 4910 V" ], "locale_variants": {} }, { "sku": "C6910-V", "brand": "SKF", "manufacturer_designation": "C 6910 V", "series": "C6900-series", "type": "carb_toroidal", "d_mm": 50, "D_mm": 72, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 140, "static_load_kN": 224, "fatigue_load_limit_kN": 26, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 6910 V belongs to the CARB family — compact aligning roller bearings: envelope 50×72×40 mm, radial rating 140/224 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (69) identify the ISO dimension series and the last two (10) encode the 50 mm bore; suffixes describe bore and execution. The V suffix denotes a full complement: the toroidal rollers fill the 40 mm space without a cage, raising C to 140 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 40 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 50 mm seat or heat it (max 120 °C) and seat it square; never press through the 40 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 50 mm bore the small CARB executions are unusually wide (40 mm) for their 72 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 140/224 kN ratings belong to this exact execution (C 6910 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 6910 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 50 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 140/224 kN ratings and 540 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 6910 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 6910 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 6910 V have?", "a": "A C 6910 V measures 50 mm bore × 72 mm outside diameter × 40 mm width (1.969 × 2.835 × 1.575 in). From SKF catalogue PUB BU/P1 17000: dynamic C 140 kN, static C0 224 kN, fatigue limit Pu 26 kN, limiting speed 2,400 r/min, no reference speed listed, mass about 540 g." } ], "cross_ref": [ { "equiv_sku": "C6910", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C6910-V", "C 6910 V" ], "locale_variants": {} }, { "sku": "C4010-TN9", "brand": "SKF", "manufacturer_designation": "C 4010 TN9", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 50, "D_mm": 80, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 116, "static_load_kN": 140, "fatigue_load_limit_kN": 16.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 4010 TN9 in the dimension series 40 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (10) encode the 50 mm bore; suffixes describe bore and execution. The TN9 suffix marks a glass fibre reinforced PA66 cage: lower friction and quieter than the full-complement V execution, with a 5,600 r/min reference speed, the usual choice for continuous-duty fans and paper rolls. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 30 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 50 mm bore the small CARB executions are unusually wide (30 mm) for their 80 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 116/140 kN ratings belong to this exact execution (C 4010 TN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4010 TN9 must float; the two are designed to be used as a pair.", "Never use C 4010 TN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 116/140 kN ratings and 550 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 4010 TN9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4010 TN9 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4010 TN9 have?", "a": "A C 4010 TN9 measures 50 mm bore × 80 mm outside diameter × 30 mm width (1.969 × 3.15 × 1.181 in). From SKF catalogue PUB BU/P1 17000: dynamic C 116 kN, static C0 140 kN, fatigue limit Pu 16.3 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 550 g." } ], "cross_ref": [ { "equiv_sku": "C4010-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×30 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and cylindrical-bore full-complement V executions (116/140 kN vs 137/176 kN) — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4010-TN9", "C 4010 TN9" ], "locale_variants": {} }, { "sku": "C4010-V", "brand": "SKF", "manufacturer_designation": "C 4010 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 50, "D_mm": 80, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 137, "static_load_kN": 176, "fatigue_load_limit_kN": 20.8, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4010 V is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 50 mm bore, 80 mm OD, 30 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 4010 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The V suffix denotes a full complement: the toroidal rollers fill the 30 mm space without a cage, raising C to 137 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 3,000 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 50 mm seat or heat it (max 120 °C) and seat it square; never press through the 30 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 50 mm bore the small CARB executions are unusually wide (30 mm) for their 80 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4010 V must float; the two are designed to be used as a pair.", "Never use C 4010 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 50 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 137/176 kN ratings and 580 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 4010 V have?", "a": "A C 4010 V measures 50 mm bore × 80 mm outside diameter × 30 mm width (1.969 × 3.15 × 1.181 in). From SKF catalogue PUB BU/P1 17000: dynamic C 137 kN, static C0 176 kN, fatigue limit Pu 20.8 kN, limiting speed 3,000 r/min, no reference speed listed, mass about 580 g." }, { "q": "What does C 4010 V mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 50 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4010 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4010 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C4010-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×30 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore TN9 PA66-caged executions (137/176 kN vs 116/140 kN) — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4010-V", "C 4010 V" ], "locale_variants": {} }, { "sku": "C2210-TN9", "brand": "SKF", "manufacturer_designation": "C 2210 TN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 98, "static_load_kN": 100, "fatigue_load_limit_kN": 11.8, "reference_speed_rpm": 7000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 2210 TN9 in the dimension series 22 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. The designation C 2210 TN9 separates into C (CARB), 22 (dimension series), 10 (50 mm bore) and TN9 (cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage); envelope 50×90×23 mm follows the ISO 15 plan. The cylindrical 50 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 50×90×23 mm are identical — only the mounting method changes. Selection arithmetic: C 98 kN against C0 100 kN gives a C0/C ratio of 1.02, and the 11.8 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 90 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 50 mm bore the small CARB executions are unusually wide (23 mm) for their 90 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2210 TN9 must float; the two are designed to be used as a pair.", "The quoted 98/100 kN ratings belong to this exact execution (C 2210 TN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 2210 TN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 98/100 kN ratings and 600 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (98 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2210 TN9 is the cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage." }, { "q": "How is C 2210 TN9 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 50 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 23 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2210 TN9?", "a": "A C 2210 TN9 measures 50 mm bore × 90 mm outside diameter × 23 mm width (1.969 × 3.543 × 0.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 98 kN, static C0 100 kN, fatigue limit Pu 11.8 kN, reference speed 7,000 r/min, limiting speed 9,500 r/min, mass about 600 g." }, { "q": "Can a CARB bearing like C 2210 TN9 locate the shaft axially?", "a": "No — that is the defining feature. C 2210 TN9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C2210-KTN9", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×23 mm ISO 15 envelope and equivalent catalogue C/C0; C 2210 KTN9 is the 1:12 tapered-bore K TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2210-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and cylindrical-bore full-complement V executions (98/100 kN vs 114/122 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22210", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (50×90×23 mm) SKF spherical roller bearing SKF 22210 E with ratings within 10 % — not a drop-in substitute: SKF 22210 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22210-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (50×90×23 mm) SKF spherical roller bearing SKF 22210 EK with ratings within 10 % — not a drop-in substitute: SKF 22210 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2210-TN9", "C 2210 TN9" ], "locale_variants": {} }, { "sku": "C2210-KTN9", "brand": "SKF", "manufacturer_designation": "C 2210 KTN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 98, "static_load_kN": 100, "fatigue_load_limit_kN": 11.8, "reference_speed_rpm": 7000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2210 KTN9 is the dimension series 22 CARB toroidal roller bearings member of the CARB range: 50 mm bore, 90 mm OD, 23 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (10) encode the 50 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 50 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2210 KTN9 deliberately carries none. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 23 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 50 mm bore the small CARB executions are unusually wide (23 mm) for their 90 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2210 KTN9 must float; the two are designed to be used as a pair.", "Never use C 2210 KTN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 50 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 7,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 98/100 kN ratings and 600 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 2210 KTN9 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 50 mm bore; KTN9 is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2210 KTN9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2210 KTN9 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C2210-TN9", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×23 mm ISO 15 envelope and equivalent catalogue C/C0; C 2210 TN9 is the cylindrical-bore TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2210-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and cylindrical-bore full-complement V executions (98/100 kN vs 114/122 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22210", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (50×90×23 mm) SKF spherical roller bearing SKF 22210 E with ratings within 10 % — not a drop-in substitute: SKF 22210 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22210-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (50×90×23 mm) SKF spherical roller bearing SKF 22210 EK with ratings within 10 % — not a drop-in substitute: SKF 22210 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2210-KTN9", "C 2210 KTN9" ], "locale_variants": {} }, { "sku": "C2210-V", "brand": "SKF", "manufacturer_designation": "C 2210 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 114, "static_load_kN": 122, "fatigue_load_limit_kN": 14.3, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2210 V combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 50 mm bore, 90 mm outside diameter, 23 mm wide unit rated 114 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 2210 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The cylindrical 50 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 50×90×23 mm are identical — only the mounting method changes. Selection arithmetic: C 114 kN against C0 122 kN gives a C0/C ratio of 1.07, and the 14.3 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 23 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 50 mm bore the small CARB executions are unusually wide (23 mm) for their 90 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 114/122 kN ratings belong to this exact execution (C 2210 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 2210 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 50 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 114/122 kN ratings and 630 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 2210 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2210 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2210 V have?", "a": "A C 2210 V measures 50 mm bore × 90 mm outside diameter × 23 mm width (1.969 × 3.543 × 0.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 114 kN, static C0 122 kN, fatigue limit Pu 14.3 kN, limiting speed 3,800 r/min, no reference speed listed, mass about 630 g." } ], "cross_ref": [ { "equiv_sku": "C2210-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore TN9 PA66-caged executions (114/122 kN vs 98/100 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2210-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (114/122 kN vs 98/100 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope as the SKF spherical roller bearing SKF 22210 E, but catalogue C/C0 differ (114/122 kN vs 107/108 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22210-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope as the SKF spherical roller bearing SKF 22210 EK, but catalogue C/C0 differ (114/122 kN vs 107/108 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2210-V", "C 2210 V" ], "locale_variants": {} }, { "sku": "C6911-V", "brand": "SKF", "manufacturer_designation": "C 6911 V", "series": "C6900-series", "type": "carb_toroidal", "d_mm": 55, "D_mm": 80, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 180, "static_load_kN": 300, "fatigue_load_limit_kN": 35.5, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 780, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 6911 V in the dimension series 69 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 6911 V the 69 dimension series fixes the 80 mm OD and 45 mm width around the 55 mm bore (code 11 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 55 mm shaft deflects; no reference speed is listed and the limiting speed is 2,200 r/min. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 6911 V deliberately carries none. Mounting: slide the bearing onto the 55 mm seat or heat it (max 120 °C) and seat it square; never press through the 45 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 55 mm bore the small CARB executions are unusually wide (45 mm) for their 80 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 180/300 kN ratings belong to this exact execution (C 6911 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 6911 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 180/300 kN ratings and 780 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 6911 V designation read?", "a": "C = CARB toroidal family; 69 = dimension series; 11 = 55 mm bore (code 11 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (180 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 6911 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 6911 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 55 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 45 mm roller set." }, { "q": "What are the dimensions and ratings of the C 6911 V?", "a": "A C 6911 V measures 55 mm bore × 80 mm outside diameter × 45 mm width (2.165 × 3.15 × 1.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 180 kN, static C0 300 kN, fatigue limit Pu 35.5 kN, limiting speed 2,200 r/min, no reference speed listed, mass about 780 g." } ], "cross_ref": [ { "equiv_sku": "C6911", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C6911-V", "C 6911 V" ], "locale_variants": {} }, { "sku": "C2211-TN9", "brand": "SKF", "manufacturer_designation": "C 2211 TN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 116, "static_load_kN": 114, "fatigue_load_limit_kN": 13.4, "reference_speed_rpm": 6300, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2211 TN9 denotes a toroidal roller bearing whose 25 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 2211 TN9 separates into C (CARB), 22 (dimension series), 11 (55 mm bore) and TN9 (cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage); envelope 55×100×25 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 55 mm seat. The 800 g mass over the 55×100×25 mm envelope yields about 2.11 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 55 mm bore the small CARB executions are unusually wide (25 mm) for their 100 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the 6,300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 116/114 kN ratings belong to this exact execution (C 2211 TN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 2211 TN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 55 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 116/114 kN ratings and 800 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2211 TN9 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 55 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 25 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2211 TN9?", "a": "A C 2211 TN9 measures 55 mm bore × 100 mm outside diameter × 25 mm width (2.165 × 3.937 × 0.984 in). From SKF catalogue PUB BU/P1 17000: dynamic C 116 kN, static C0 114 kN, fatigue limit Pu 13.4 kN, reference speed 6,300 r/min, limiting speed 9,000 r/min, mass about 800 g." }, { "q": "Can a CARB bearing like C 2211 TN9 locate the shaft axially?", "a": "No — that is the defining feature. C 2211 TN9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2211 TN9 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 11 = 55 mm bore (code 11 × 5); suffix TN9 selects cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2211-KTN9", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×25 mm ISO 15 envelope and equivalent catalogue C/C0; C 2211 KTN9 is the 1:12 tapered-bore K TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2211-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and cylindrical-bore full-complement V executions (116/114 kN vs 132/134 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2211-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and 1:12 tapered-bore K full-complement V executions (116/114 kN vs 132/134 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope as the SKF spherical roller bearing SKF 22211 E, but catalogue C/C0 differ (116/114 kN vs 129/127 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22211-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope as the SKF spherical roller bearing SKF 22211 EK, but catalogue C/C0 differ (116/114 kN vs 129/127 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2211-TN9", "C 2211 TN9" ], "locale_variants": {} }, { "sku": "C2211-KTN9", "brand": "SKF", "manufacturer_designation": "C 2211 KTN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 116, "static_load_kN": 114, "fatigue_load_limit_kN": 13.4, "reference_speed_rpm": 6300, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2211 KTN9 denotes a toroidal roller bearing whose 25 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 2211 KTN9 separates into C (CARB), 22 (dimension series), 11 (55 mm bore) and KTN9 (tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage); envelope 55×100×25 mm follows the ISO 15 plan. The TN9 suffix marks a glass fibre reinforced PA66 cage: lower friction and quieter than the full-complement V execution, with a 6,300 r/min reference speed, the usual choice for continuous-duty fans and paper rolls. The 800 g mass over the 55×100×25 mm envelope yields about 2.11 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 25 mm wide cavity does not fill itself.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 55 mm bore the small CARB executions are unusually wide (25 mm) for their 100 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the 6,300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 116/114 kN ratings belong to this exact execution (C 2211 KTN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 2211 KTN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 55 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 116/114 kN ratings and 800 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (116 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2211 KTN9 is the tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage." }, { "q": "How is C 2211 KTN9 mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2211 KTN9?", "a": "A C 2211 KTN9 measures 55 mm bore × 100 mm outside diameter × 25 mm width (2.165 × 3.937 × 0.984 in). From SKF catalogue PUB BU/P1 17000: dynamic C 116 kN, static C0 114 kN, fatigue limit Pu 13.4 kN, reference speed 6,300 r/min, limiting speed 9,000 r/min, mass about 800 g." }, { "q": "Can a CARB bearing like C 2211 KTN9 locate the shaft axially?", "a": "No — that is the defining feature. C 2211 KTN9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C2211-TN9", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×25 mm ISO 15 envelope and equivalent catalogue C/C0; C 2211 TN9 is the cylindrical-bore TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2211-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and cylindrical-bore full-complement V executions (116/114 kN vs 132/134 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2211-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and 1:12 tapered-bore K full-complement V executions (116/114 kN vs 132/134 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22211", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope as the SKF spherical roller bearing SKF 22211 E, but catalogue C/C0 differ (116/114 kN vs 129/127 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22211-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope as the SKF spherical roller bearing SKF 22211 EK, but catalogue C/C0 differ (116/114 kN vs 129/127 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2211-KTN9", "C 2211 KTN9" ], "locale_variants": {} }, { "sku": "C2211-V", "brand": "SKF", "manufacturer_designation": "C 2211 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 132, "static_load_kN": 134, "fatigue_load_limit_kN": 15.6, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2211 V is the dimension series 22 CARB toroidal roller bearings member of the CARB range: 55 mm bore, 100 mm OD, 25 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 2211 V separates into C (CARB), 22 (dimension series), 11 (55 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 55×100×25 mm follows the ISO 15 plan. The V suffix denotes a full complement: the toroidal rollers fill the 25 mm space without a cage, raising C to 132 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 3,400 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 25 mm wide cavity does not fill itself.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 55 mm bore the small CARB executions are unusually wide (25 mm) for their 100 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 132/134 kN ratings belong to this exact execution (C 2211 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 2211 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 55 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 132/134 kN ratings and 820 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 2211 V designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 11 = 55 mm bore (code 11 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (132 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2211 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 2211 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 55 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 25 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2211 V?", "a": "A C 2211 V measures 55 mm bore × 100 mm outside diameter × 25 mm width (2.165 × 3.937 × 0.984 in). From SKF catalogue PUB BU/P1 17000: dynamic C 132 kN, static C0 134 kN, fatigue limit Pu 15.6 kN, limiting speed 3,400 r/min, no reference speed listed, mass about 820 g." } ], "cross_ref": [ { "equiv_sku": "C2211-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore TN9 PA66-caged executions (132/134 kN vs 116/114 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2211-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (132/134 kN vs 116/114 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2211-KV", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×25 mm ISO 15 envelope and equivalent catalogue C/C0; C 2211 KV is the 1:12 tapered-bore K full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22211", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (55×100×25 mm) SKF spherical roller bearing SKF 22211 E with ratings within 10 % — not a drop-in substitute: SKF 22211 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22211-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (55×100×25 mm) SKF spherical roller bearing SKF 22211 EK with ratings within 10 % — not a drop-in substitute: SKF 22211 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2211-V", "C 2211 V" ], "locale_variants": {} }, { "sku": "C2211-KV", "brand": "SKF", "manufacturer_designation": "C 2211 KV", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 132, "static_load_kN": 134, "fatigue_load_limit_kN": 15.6, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2211 KV: the toroidal rollers allow the 55 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 2211 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KV. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 55 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2211 KV deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 55 mm bore the small CARB executions are unusually wide (25 mm) for their 100 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 55 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 132/134 kN ratings belong to this exact execution (C 2211 KV); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 2211 KV as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 132/134 kN ratings and 820 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2211 KV have?", "a": "A C 2211 KV measures 55 mm bore × 100 mm outside diameter × 25 mm width (2.165 × 3.937 × 0.984 in). From SKF catalogue PUB BU/P1 17000: dynamic C 132 kN, static C0 134 kN, fatigue limit Pu 15.6 kN, limiting speed 3,400 r/min, no reference speed listed, mass about 820 g." }, { "q": "What does C 2211 KV mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 55 mm bore; KV is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2211 KV used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2211 KV sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C2211-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and cylindrical-bore TN9 PA66-caged executions (132/134 kN vs 116/114 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2211-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (132/134 kN vs 116/114 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2211-V", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×25 mm ISO 15 envelope and equivalent catalogue C/C0; C 2211 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22211", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (55×100×25 mm) SKF spherical roller bearing SKF 22211 E with ratings within 10 % — not a drop-in substitute: SKF 22211 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22211-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (55×100×25 mm) SKF spherical roller bearing SKF 22211 EK with ratings within 10 % — not a drop-in substitute: SKF 22211 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2211-KV", "C 2211 KV" ], "locale_variants": {} }, { "sku": "C6912-2NSV", "brand": "SKF", "manufacturer_designation": "C 6912-2NSV", "series": "C6900-series", "type": "carb_toroidal", "d_mm": 60, "D_mm": 85, "B_mm": 45, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 190, "static_load_kN": 335, "fatigue_load_limit_kN": 39, "weight_g": 830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 6912-2NSV is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 60×85×45 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 6912 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here 2NSV. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 60 mm seat. Selection arithmetic: C 190 kN against C0 335 kN gives a C0/C ratio of 1.76, and the 39 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 60 mm bore the small CARB executions are unusually wide (45 mm) for their 85 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 190/335 kN ratings belong to this exact execution (C 6912-2NSV); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 6912-2NSV as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 60 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 190/335 kN ratings and 830 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 6912-2NSV sealed?", "a": "Yes — this is a sealed full-complement execution (2NSV nitrile seals), greased at the factory; the catalogue lists no reference speed or limiting speed." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 6912-2NSV have?", "a": "A C 6912-2NSV measures 60 mm bore × 85 mm outside diameter × 45 mm width (2.362 × 3.346 × 1.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 190 kN, static C0 335 kN, fatigue limit Pu 39 kN, no reference or limiting speeds are listed (sealed, grease-filled execution), mass about 830 g." }, { "q": "What does C 6912-2NSV mean in SKF part numbering?", "a": "C marks CARB; 69 the dimension series; the size code gives 60 mm bore; 2NSV is the execution (cylindrical bore for direct shaft fitting, 2NSV sealed full-complement execution). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C6912-V", "equiv_brand": "SKF", "level": "full", "note": "Same 60×85×45 mm ISO 15 envelope and equivalent catalogue C/C0; C 6912 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C6912-2NSV", "C 6912-2NSV" ], "locale_variants": {} }, { "sku": "C6912-V", "brand": "SKF", "manufacturer_designation": "C 6912 V", "series": "C6900-series", "type": "carb_toroidal", "d_mm": 60, "D_mm": 85, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 190, "static_load_kN": 335, "fatigue_load_limit_kN": 39, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 6912 V: the toroidal rollers allow the 60 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 6912 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 60 mm shaft deflects; no reference speed is listed and the limiting speed is 1,900 r/min. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 1,900 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 60 mm bore the small CARB executions are unusually wide (45 mm) for their 85 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 60 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 6912 V must float; the two are designed to be used as a pair.", "The 190/335 kN ratings and 830 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 6912 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 6912 V have?", "a": "A C 6912 V measures 60 mm bore × 85 mm outside diameter × 45 mm width (2.362 × 3.346 × 1.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 190 kN, static C0 335 kN, fatigue limit Pu 39 kN, limiting speed 1,900 r/min, no reference speed listed, mass about 830 g." }, { "q": "What does C 6912 V mean in SKF part numbering?", "a": "C marks CARB; 69 the dimension series; the size code gives 60 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C6912-2NSV", "equiv_brand": "SKF", "level": "full", "note": "Same 60×85×45 mm ISO 15 envelope and equivalent catalogue C/C0; C 6912-2NSV is the cylindrical-bore sealed full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C6912-V", "C 6912 V" ], "locale_variants": {} }, { "sku": "C2212-TN9", "brand": "SKF", "manufacturer_designation": "C 2212 TN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 143, "static_load_kN": 156, "fatigue_load_limit_kN": 18.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2212 TN9: the toroidal rollers allow the 60 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 2212 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here TN9. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 60 mm shaft deflects; the 5,600 r/min reference and 7,500 r/min limiting speed are both catalogue values. Selection arithmetic: C 143 kN against C0 156 kN gives a C0/C ratio of 1.09, and the 18.3 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 60 mm seat or heat it (max 120 °C) and seat it square; never press through the 28 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 60 mm bore the small CARB executions are unusually wide (28 mm) for their 110 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 60 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 5,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 2212 TN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 143/156 kN ratings belong to this exact execution (C 2212 TN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 143/156 kN ratings and 1100 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2212 TN9 have?", "a": "A C 2212 TN9 measures 60 mm bore × 110 mm outside diameter × 28 mm width (2.362 × 4.331 × 1.102 in). From SKF catalogue PUB BU/P1 17000: dynamic C 143 kN, static C0 156 kN, fatigue limit Pu 18.3 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1100 g." }, { "q": "What does C 2212 TN9 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 60 mm bore; TN9 is the execution (cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2212 TN9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2212 TN9 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C2212-KTN9", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×28 mm ISO 15 envelope and equivalent catalogue C/C0; C 2212 KTN9 is the 1:12 tapered-bore K TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2212-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and cylindrical-bore full-complement V executions (143/156 kN vs 166/190 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2212-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and 1:12 tapered-bore K full-complement V executions (143/156 kN vs 166/190 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope as the SKF spherical roller bearing SKF 22212 E, but catalogue C/C0 differ (143/156 kN vs 159/166 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22212-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope as the SKF spherical roller bearing SKF 22212 EK, but catalogue C/C0 differ (143/156 kN vs 159/166 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2212-TN9", "C 2212 TN9" ], "locale_variants": {} }, { "sku": "C2212-KTN9", "brand": "SKF", "manufacturer_designation": "C 2212 KTN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 143, "static_load_kN": 156, "fatigue_load_limit_kN": 18.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2212 KTN9 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 60×110×28 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 2212 KTN9 separates into C (CARB), 22 (dimension series), 12 (60 mm bore) and KTN9 (tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage); envelope 60×110×28 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 60 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2212 KTN9 deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 110 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 60 mm bore the small CARB executions are unusually wide (28 mm) for their 110 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2212 KTN9 must float; the two are designed to be used as a pair.", "The quoted 143/156 kN ratings belong to this exact execution (C 2212 KTN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 2212 KTN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 143/156 kN ratings and 1100 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 2212 KTN9?", "a": "A C 2212 KTN9 measures 60 mm bore × 110 mm outside diameter × 28 mm width (2.362 × 4.331 × 1.102 in). From SKF catalogue PUB BU/P1 17000: dynamic C 143 kN, static C0 156 kN, fatigue limit Pu 18.3 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1100 g." }, { "q": "Can a CARB bearing like C 2212 KTN9 locate the shaft axially?", "a": "No — that is the defining feature. C 2212 KTN9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2212 KTN9 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 12 = 60 mm bore (code 12 × 5); suffix KTN9 selects tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (143 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2212 KTN9 is the tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage." } ], "cross_ref": [ { "equiv_sku": "C2212-TN9", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×28 mm ISO 15 envelope and equivalent catalogue C/C0; C 2212 TN9 is the cylindrical-bore TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2212-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and cylindrical-bore full-complement V executions (143/156 kN vs 166/190 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2212-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and 1:12 tapered-bore K full-complement V executions (143/156 kN vs 166/190 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope as the SKF spherical roller bearing SKF 22212 E, but catalogue C/C0 differ (143/156 kN vs 159/166 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22212-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope as the SKF spherical roller bearing SKF 22212 EK, but catalogue C/C0 differ (143/156 kN vs 159/166 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2212-KTN9", "C 2212 KTN9" ], "locale_variants": {} }, { "sku": "C2212-V", "brand": "SKF", "manufacturer_designation": "C 2212 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 166, "static_load_kN": 190, "fatigue_load_limit_kN": 22.4, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2212 V denotes a toroidal roller bearing whose 28 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (12) encode the 60 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 60 mm shaft deflects; no reference speed is listed and the limiting speed is 2,800 r/min. The 1150 g mass over the 60×110×28 mm envelope yields about 2.77 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 28 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 60 mm bore the small CARB executions are unusually wide (28 mm) for their 110 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 60 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 2212 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 166/190 kN ratings belong to this exact execution (C 2212 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 166/190 kN ratings and 1150 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 2212 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2212 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2212 V have?", "a": "A C 2212 V measures 60 mm bore × 110 mm outside diameter × 28 mm width (2.362 × 4.331 × 1.102 in). From SKF catalogue PUB BU/P1 17000: dynamic C 166 kN, static C0 190 kN, fatigue limit Pu 22.4 kN, limiting speed 2,800 r/min, no reference speed listed, mass about 1150 g." } ], "cross_ref": [ { "equiv_sku": "C2212-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore TN9 PA66-caged executions (166/190 kN vs 143/156 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2212-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (166/190 kN vs 143/156 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2212-KV", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×28 mm ISO 15 envelope and equivalent catalogue C/C0; C 2212 KV is the 1:12 tapered-bore K full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope as the SKF spherical roller bearing SKF 22212 E, but catalogue C/C0 differ (166/190 kN vs 159/166 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22212-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope as the SKF spherical roller bearing SKF 22212 EK, but catalogue C/C0 differ (166/190 kN vs 159/166 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2212-V", "C 2212 V" ], "locale_variants": {} }, { "sku": "C2212-KV", "brand": "SKF", "manufacturer_designation": "C 2212 KV", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 166, "static_load_kN": 190, "fatigue_load_limit_kN": 22.4, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2212 KV: the toroidal rollers allow the 60 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 2212 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KV. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 60 mm shaft deflects; no reference speed is listed and the limiting speed is 2,800 r/min. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2212 KV deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 28 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 60 mm bore the small CARB executions are unusually wide (28 mm) for their 110 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 166/190 kN ratings belong to this exact execution (C 2212 KV); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 2212 KV as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 60 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 166/190 kN ratings and 1150 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2212 KV have?", "a": "A C 2212 KV measures 60 mm bore × 110 mm outside diameter × 28 mm width (2.362 × 4.331 × 1.102 in). From SKF catalogue PUB BU/P1 17000: dynamic C 166 kN, static C0 190 kN, fatigue limit Pu 22.4 kN, limiting speed 2,800 r/min, no reference speed listed, mass about 1150 g." }, { "q": "What does C 2212 KV mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 60 mm bore; KV is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2212 KV used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2212 KV sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C2212-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and cylindrical-bore TN9 PA66-caged executions (166/190 kN vs 143/156 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2212-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (166/190 kN vs 143/156 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2212-V", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×28 mm ISO 15 envelope and equivalent catalogue C/C0; C 2212 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22212", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope as the SKF spherical roller bearing SKF 22212 E, but catalogue C/C0 differ (166/190 kN vs 159/166 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22212-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope as the SKF spherical roller bearing SKF 22212 EK, but catalogue C/C0 differ (166/190 kN vs 159/166 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2212-KV", "C 2212 KV" ], "locale_variants": {} }, { "sku": "C4013-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 4013-2CS5V/GEM9", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 65, "D_mm": 100, "B_mm": 35, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 102, "static_load_kN": 173, "fatigue_load_limit_kN": 20.4, "limiting_speed_rpm": 150, "max_rpm": 150, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4013-2CS5V/GEM9 belongs to the CARB family — compact aligning roller bearings: envelope 65×100×35 mm, radial rating 102/173 kN C/C0, and no axial-locating function by design. In C 4013-2CS5V/GEM9 the 40 dimension series fixes the 100 mm OD and 35 mm width around the 65 mm bore (the bore is written directly after the slash (no bore code)); the suffix 2CS5V/GEM9 then selects the cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. The 2CS5V/GEM9 execution adds nitrile contact seals on both sides plus an annular-groove relubrication feature and a high-viscosity grease fill; the full-complement rollers keep 102 kN dynamic at a reduced 150 r/min ceiling. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 35 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 65 mm bore the small CARB executions are unusually wide (35 mm) for their 100 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 102/173 kN ratings belong to this exact execution (C 4013-2CS5V/GEM9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 4013-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 65 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 102/173 kN ratings and 1050 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 4013-2CS5V/GEM9 designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 65 mm (slash-size) = 65 mm bore (the bore is written directly after the slash (no bore code)); suffix 2CS5V/GEM9 selects cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (102 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4013-2CS5V/GEM9 is the cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove." }, { "q": "How is C 4013-2CS5V/GEM9 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 65 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 35 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4013-2CS5V/GEM9?", "a": "A C 4013-2CS5V/GEM9 measures 65 mm bore × 100 mm outside diameter × 35 mm width (2.559 × 3.937 × 1.378 in). From SKF catalogue PUB BU/P1 17000: dynamic C 102 kN, static C0 173 kN, fatigue limit Pu 20.4 kN, limiting speed 150 r/min, no reference speed listed, mass about 1050 g." } ], "cross_ref": [ { "equiv_sku": "24013", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×100×35 mm envelope as the SKF spherical roller bearing SKF 24013 CC/W33, but catalogue C/C0 differ (102/173 kN vs 137/173 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4013-2CS5V-GEM9", "C 4013-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C2213-TN9", "brand": "SKF", "manufacturer_designation": "C 2213 TN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 180, "static_load_kN": 180, "fatigue_load_limit_kN": 21.2, "reference_speed_rpm": 5300, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2213 TN9 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 65×120×31 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 2213 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here TN9. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 65 mm shaft deflects; the 5,300 r/min reference and 7,500 r/min limiting speed are both catalogue values. Speed planning separates the 5,300 r/min thermal reference from the 7,500 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the TN9-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 120 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 65 mm bore the small CARB executions are unusually wide (31 mm) for their 120 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2213 TN9 must float; the two are designed to be used as a pair.", "Never use C 2213 TN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 65 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 5,300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 180/180 kN ratings and 1450 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2213 TN9 have?", "a": "A C 2213 TN9 measures 65 mm bore × 120 mm outside diameter × 31 mm width (2.559 × 4.724 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 180 kN, static C0 180 kN, fatigue limit Pu 21.2 kN, reference speed 5,300 r/min, limiting speed 7,500 r/min, mass about 1450 g." }, { "q": "What does C 2213 TN9 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 65 mm bore; TN9 is the execution (cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2213 TN9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2213 TN9 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C2213-KTN9", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×31 mm ISO 15 envelope and equivalent catalogue C/C0; C 2213 KTN9 is the 1:12 tapered-bore K TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2213-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and cylindrical-bore full-complement V executions (180/180 kN vs 204/216 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2213-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and 1:12 tapered-bore K full-complement V executions (180/180 kN vs 204/216 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope as the SKF spherical roller bearing SKF 22213 E, but catalogue C/C0 differ (180/180 kN vs 198/216 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22213-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope as the SKF spherical roller bearing SKF 22213 EK, but catalogue C/C0 differ (180/180 kN vs 198/216 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2213-TN9", "C 2213 TN9" ], "locale_variants": {} }, { "sku": "C2213-KTN9", "brand": "SKF", "manufacturer_designation": "C 2213 KTN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 180, "static_load_kN": 180, "fatigue_load_limit_kN": 21.2, "reference_speed_rpm": 5300, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2213 KTN9 belongs to the CARB family — compact aligning roller bearings: envelope 65×120×31 mm, radial rating 180/180 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 2213 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KTN9. The K suffix gives a 1:12 tapered 65 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 65×120×31 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 31 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 120 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 65 mm bore the small CARB executions are unusually wide (31 mm) for their 120 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 65 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 5,300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2213 KTN9 must float; the two are designed to be used as a pair.", "Never use C 2213 KTN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 180/180 kN ratings and 1450 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 2213 KTN9 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2213 KTN9 have?", "a": "A C 2213 KTN9 measures 65 mm bore × 120 mm outside diameter × 31 mm width (2.559 × 4.724 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 180 kN, static C0 180 kN, fatigue limit Pu 21.2 kN, reference speed 5,300 r/min, limiting speed 7,500 r/min, mass about 1450 g." }, { "q": "What does C 2213 KTN9 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 65 mm bore; KTN9 is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C2213-TN9", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×31 mm ISO 15 envelope and equivalent catalogue C/C0; C 2213 TN9 is the cylindrical-bore TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2213-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and cylindrical-bore full-complement V executions (180/180 kN vs 204/216 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2213-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and 1:12 tapered-bore K full-complement V executions (180/180 kN vs 204/216 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope as the SKF spherical roller bearing SKF 22213 E, but catalogue C/C0 differ (180/180 kN vs 198/216 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22213-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope as the SKF spherical roller bearing SKF 22213 EK, but catalogue C/C0 differ (180/180 kN vs 198/216 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2213-KTN9", "C 2213 KTN9" ], "locale_variants": {} }, { "sku": "C2213-V", "brand": "SKF", "manufacturer_designation": "C 2213 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 204, "static_load_kN": 216, "fatigue_load_limit_kN": 25.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 1500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2213 V is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 65×120×31 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 2213 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 65 mm seat. The 1500 g mass over the 65×120×31 mm envelope yields about 3.14 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 31 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 65 mm bore the small CARB executions are unusually wide (31 mm) for their 120 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2213 V must float; the two are designed to be used as a pair.", "Never use C 2213 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 65 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 204/216 kN ratings and 1500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 2213 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2213 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2213 V have?", "a": "A C 2213 V measures 65 mm bore × 120 mm outside diameter × 31 mm width (2.559 × 4.724 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 204 kN, static C0 216 kN, fatigue limit Pu 25.5 kN, limiting speed 2,400 r/min, no reference speed listed, mass about 1500 g." } ], "cross_ref": [ { "equiv_sku": "C2213-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore TN9 PA66-caged executions (204/216 kN vs 180/180 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2213-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (204/216 kN vs 180/180 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2213-KV", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×31 mm ISO 15 envelope and equivalent catalogue C/C0; C 2213 KV is the 1:12 tapered-bore K full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22213", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (65×120×31 mm) SKF spherical roller bearing SKF 22213 E with ratings within 10 % — not a drop-in substitute: SKF 22213 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22213-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (65×120×31 mm) SKF spherical roller bearing SKF 22213 EK with ratings within 10 % — not a drop-in substitute: SKF 22213 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2213-V", "C 2213 V" ], "locale_variants": {} }, { "sku": "C2213-KV", "brand": "SKF", "manufacturer_designation": "C 2213 KV", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 204, "static_load_kN": 216, "fatigue_load_limit_kN": 25.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 1500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2213 KV denotes a toroidal roller bearing whose 31 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 2213 KV separates into C (CARB), 22 (dimension series), 13 (65 mm bore) and KV (tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage)); envelope 65×120×31 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 65 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 65×120×31 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 31 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 31 mm wide cavity does not fill itself.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 65 mm bore the small CARB executions are unusually wide (31 mm) for their 120 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2213 KV must float; the two are designed to be used as a pair.", "Never use C 2213 KV as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 65 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 204/216 kN ratings and 1500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 2213 KV?", "a": "A C 2213 KV measures 65 mm bore × 120 mm outside diameter × 31 mm width (2.559 × 4.724 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 204 kN, static C0 216 kN, fatigue limit Pu 25.5 kN, limiting speed 2,400 r/min, no reference speed listed, mass about 1500 g." }, { "q": "Can a CARB bearing like C 2213 KV locate the shaft axially?", "a": "No — that is the defining feature. C 2213 KV deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2213 KV designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 13 = 65 mm bore (code 13 × 5); suffix KV selects tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (204 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2213 KV is the tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage)." } ], "cross_ref": [ { "equiv_sku": "C2213-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and cylindrical-bore TN9 PA66-caged executions (204/216 kN vs 180/180 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2213-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (204/216 kN vs 180/180 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2213-V", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×31 mm ISO 15 envelope and equivalent catalogue C/C0; C 2213 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22213", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (65×120×31 mm) SKF spherical roller bearing SKF 22213 E with ratings within 10 % — not a drop-in substitute: SKF 22213 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22213-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (65×120×31 mm) SKF spherical roller bearing SKF 22213 EK with ratings within 10 % — not a drop-in substitute: SKF 22213 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2213-KV", "C 2213 KV" ], "locale_variants": {} }, { "sku": "C2214-TN9", "brand": "SKF", "manufacturer_designation": "C 2214 TN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 186, "static_load_kN": 196, "fatigue_load_limit_kN": 22.8, "reference_speed_rpm": 5000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 1500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2214 TN9 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 70 mm bore, 125 mm outside diameter, 31 mm wide unit rated 186 kN dynamic. In C 2214 TN9 the 22 dimension series fixes the 125 mm OD and 31 mm width around the 70 mm bore (code 14 × 5); the suffix TN9 then selects the cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage. The TN9 suffix marks a glass fibre reinforced PA66 cage: lower friction and quieter than the full-complement V execution, with a 5,000 r/min reference speed, the usual choice for continuous-duty fans and paper rolls. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2214 TN9 deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 70 mm bore the small CARB executions are unusually wide (31 mm) for their 125 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2214 TN9 must float; the two are designed to be used as a pair.", "Never use C 2214 TN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 70 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 186/196 kN ratings and 1500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 2214 TN9 locate the shaft axially?", "a": "No — that is the defining feature. C 2214 TN9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2214 TN9 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 14 = 70 mm bore (code 14 × 5); suffix TN9 selects cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (186 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2214 TN9 is the cylindrical bore for direct shaft fitting, TN9 glass-fibre PA66 cage." }, { "q": "How is C 2214 TN9 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 70 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 31 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C2214-KTN9", "equiv_brand": "SKF", "level": "full", "note": "Same 70×125×31 mm ISO 15 envelope and equivalent catalogue C/C0; C 2214 KTN9 is the 1:12 tapered-bore K TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2214-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore TN9 PA66-caged and cylindrical-bore full-complement V executions (186/196 kN vs 212/228 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope as the SKF spherical roller bearing SKF 22214 E, but catalogue C/C0 differ (186/196 kN vs 213/228 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22214-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope as the SKF spherical roller bearing SKF 22214 EK, but catalogue C/C0 differ (186/196 kN vs 213/228 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2214-TN9", "C 2214 TN9" ], "locale_variants": {} }, { "sku": "C2214-KTN9", "brand": "SKF", "manufacturer_designation": "C 2214 KTN9", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 186, "static_load_kN": 196, "fatigue_load_limit_kN": 22.8, "reference_speed_rpm": 5000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 1500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 2214 KTN9 in the dimension series 22 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 2214 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KTN9. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 70 mm shaft deflects; the 5,000 r/min reference and 7,000 r/min limiting speed are both catalogue values. Selection arithmetic: C 186 kN against C0 196 kN gives a C0/C ratio of 1.05, and the 22.8 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 70 mm bore the small CARB executions are unusually wide (31 mm) for their 125 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 186/196 kN ratings belong to this exact execution (C 2214 KTN9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 2214 KTN9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 70 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 186/196 kN ratings and 1500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2214 KTN9 have?", "a": "A C 2214 KTN9 measures 70 mm bore × 125 mm outside diameter × 31 mm width (2.756 × 4.921 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 186 kN, static C0 196 kN, fatigue limit Pu 22.8 kN, reference speed 5,000 r/min, limiting speed 7,000 r/min, mass about 1500 g." }, { "q": "What does C 2214 KTN9 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 70 mm bore; KTN9 is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, TN9 glass-fibre PA66 cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2214 KTN9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2214 KTN9 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C2214-TN9", "equiv_brand": "SKF", "level": "full", "note": "Same 70×125×31 mm ISO 15 envelope and equivalent catalogue C/C0; C 2214 TN9 is the cylindrical-bore TN9 PA66-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2214-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K TN9 PA66-caged and cylindrical-bore full-complement V executions (186/196 kN vs 212/228 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope as the SKF spherical roller bearing SKF 22214 E, but catalogue C/C0 differ (186/196 kN vs 213/228 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22214-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope as the SKF spherical roller bearing SKF 22214 EK, but catalogue C/C0 differ (186/196 kN vs 213/228 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2214-KTN9", "C 2214 KTN9" ], "locale_variants": {} }, { "sku": "C2214-V", "brand": "SKF", "manufacturer_designation": "C 2214 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 212, "static_load_kN": 228, "fatigue_load_limit_kN": 26.5, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2214 V belongs to the CARB family — compact aligning roller bearings: envelope 70×125×31 mm, radial rating 212/228 kN C/C0, and no axial-locating function by design. The designation C 2214 V separates into C (CARB), 22 (dimension series), 14 (70 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 70×125×31 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 70 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2214 V deliberately carries none. Mounting: slide the bearing onto the 70 mm seat or heat it (max 120 °C) and seat it square; never press through the 31 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 70 mm bore the small CARB executions are unusually wide (31 mm) for their 125 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2214 V must float; the two are designed to be used as a pair.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 70 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 212/228 kN ratings and 1550 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (212 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2214 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 2214 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 70 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 31 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2214 V?", "a": "A C 2214 V measures 70 mm bore × 125 mm outside diameter × 31 mm width (2.756 × 4.921 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 212 kN, static C0 228 kN, fatigue limit Pu 26.5 kN, limiting speed 2,400 r/min, no reference speed listed, mass about 1550 g." }, { "q": "Can a CARB bearing like C 2214 V locate the shaft axially?", "a": "No — that is the defining feature. C 2214 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C2214-TN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore TN9 PA66-caged executions (212/228 kN vs 186/196 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2214-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K TN9 PA66-caged executions (212/228 kN vs 186/196 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22214", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (70×125×31 mm) SKF spherical roller bearing SKF 22214 E with ratings within 10 % — not a drop-in substitute: SKF 22214 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22214-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (70×125×31 mm) SKF spherical roller bearing SKF 22214 EK with ratings within 10 % — not a drop-in substitute: SKF 22214 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2214-V", "C 2214 V" ], "locale_variants": {} }, { "sku": "C2314", "brand": "SKF", "manufacturer_designation": "C 2314", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 405, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 4300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2314 denotes a toroidal roller bearing whose 51 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 2314 separates into C (CARB), 23 (dimension series), 14 (70 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 70×150×51 mm follows the ISO 15 plan. The cylindrical 70 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 70×150×51 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 51 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 51 mm wide cavity does not fill itself.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 70 mm bore the small CARB executions are unusually wide (51 mm) for their 150 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2314 must float; the two are designed to be used as a pair.", "Never use C 2314 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 70 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 405/430 kN ratings and 4300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2314 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 70 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 51 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2314?", "a": "A C 2314 measures 70 mm bore × 150 mm outside diameter × 51 mm width (2.756 × 5.906 × 2.008 in). From SKF catalogue PUB BU/P1 17000: dynamic C 405 kN, static C0 430 kN, fatigue limit Pu 49 kN, reference speed 3,800 r/min, limiting speed 5,000 r/min, mass about 4300 g." }, { "q": "Can a CARB bearing like C 2314 locate the shaft axially?", "a": "No — that is the defining feature. C 2314 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2314 designation read?", "a": "C = CARB toroidal family; 23 = dimension series; 14 = 70 mm bore (code 14 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2314-K", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×51 mm ISO 15 envelope and equivalent catalogue C/C0; C 2314 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22314", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (70×150×51 mm) SKF spherical roller bearing SKF 22314 E with ratings within 10 % — not a drop-in substitute: SKF 22314 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22314-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (70×150×51 mm) SKF spherical roller bearing SKF 22314 EK with ratings within 10 % — not a drop-in substitute: SKF 22314 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2314", "C 2314" ], "locale_variants": {} }, { "sku": "C2314-K", "brand": "SKF", "manufacturer_designation": "C 2314 K", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 405, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 4300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2314 K combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 70 mm bore, 150 mm outside diameter, 51 mm wide unit rated 405 kN dynamic. The designation C 2314 K separates into C (CARB), 23 (dimension series), 14 (70 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 70×150×51 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 70 mm shaft deflects; the 3,800 r/min reference and 5,000 r/min limiting speed are both catalogue values. The 4300 g mass over the 70×150×51 mm envelope yields about 5.79 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 51 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 70 mm bore the small CARB executions are unusually wide (51 mm) for their 150 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the 3,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 405/430 kN ratings belong to this exact execution (C 2314 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 70 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Never use C 2314 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 405/430 kN ratings and 4300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 2314 K?", "a": "A C 2314 K measures 70 mm bore × 150 mm outside diameter × 51 mm width (2.756 × 5.906 × 2.008 in). From SKF catalogue PUB BU/P1 17000: dynamic C 405 kN, static C0 430 kN, fatigue limit Pu 49 kN, reference speed 3,800 r/min, limiting speed 5,000 r/min, mass about 4300 g." }, { "q": "Can a CARB bearing like C 2314 K locate the shaft axially?", "a": "No — that is the defining feature. C 2314 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2314 K designation read?", "a": "C = CARB toroidal family; 23 = dimension series; 14 = 70 mm bore (code 14 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (405 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2314 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C2314", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×51 mm ISO 15 envelope and equivalent catalogue C/C0; C 2314 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22314", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (70×150×51 mm) SKF spherical roller bearing SKF 22314 E with ratings within 10 % — not a drop-in substitute: SKF 22314 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22314-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (70×150×51 mm) SKF spherical roller bearing SKF 22314 EK with ratings within 10 % — not a drop-in substitute: SKF 22314 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2314-K", "C 2314 K" ], "locale_variants": {} }, { "sku": "C5915-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 5915-2CS5V/GEM9", "series": "C5900-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 105, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 166, "static_load_kN": 232, "fatigue_load_limit_kN": 30, "limiting_speed_rpm": 130, "max_rpm": 130, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 5915-2CS5V/GEM9 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 75×105×40 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 5915 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here 2CS5V/GEM9. Both-side contact seals protect the full-complement roller set in contaminated housings, with grease for life at fitting. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 75 mm shaft deflects; no reference speed is listed and the limiting speed is 130 r/min. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 130 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 75 mm seat or heat it (max 120 °C) and seat it square; never press through the 40 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (40 mm) for their 105 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 5915-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 166/232 kN ratings belong to this exact execution (C 5915-2CS5V/GEM9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 166/232 kN ratings and 3900 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 5915-2CS5V/GEM9 have?", "a": "A C 5915-2CS5V/GEM9 measures 75 mm bore × 105 mm outside diameter × 40 mm width (2.953 × 4.134 × 1.575 in). From SKF catalogue PUB BU/P1 17000: dynamic C 166 kN, static C0 232 kN, fatigue limit Pu 30 kN, limiting speed 130 r/min, no reference speed listed, mass about 3900 g." }, { "q": "What does C 5915-2CS5V/GEM9 mean in SKF part numbering?", "a": "C marks CARB; 59 the dimension series; the size code gives 75 mm bore; 2CS5V/GEM9 is the execution (cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 5915-2CS5V/GEM9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C5915-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×40 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore full-complement V executions (166/232 kN vs 204/325 kN) — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C5915-2CS5V-GEM9", "C 5915-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C5915-V", "brand": "SKF", "manufacturer_designation": "C 5915 V", "series": "C5900-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 105, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 204, "static_load_kN": 325, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 5915 V is the dimension series 59 CARB toroidal roller bearings member of the CARB range: 75 mm bore, 105 mm OD, 40 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 5915 V separates into C (CARB), 59 (dimension series), 15 (75 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 75×105×40 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 75 mm seat. Selection arithmetic: C 204 kN against C0 325 kN gives a C0/C ratio of 1.59, and the 38 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 105 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (40 mm) for their 105 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Never use C 5915 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The quoted 204/325 kN ratings belong to this exact execution (C 5915 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 204/325 kN ratings and 1100 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 5915 V locate the shaft axially?", "a": "No — that is the defining feature. C 5915 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 5915 V designation read?", "a": "C = CARB toroidal family; 59 = dimension series; 15 = 75 mm bore (code 15 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (204 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 5915 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 5915 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 75 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 40 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C5915-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×40 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore sealed full-complement V executions (204/325 kN vs 166/232 kN) — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C5915-V", "C 5915 V" ], "locale_variants": {} }, { "sku": "C6915-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 6915-2CS5V/GEM9", "series": "C6900-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 105, "B_mm": 54, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 204, "static_load_kN": 325, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 140, "max_rpm": 140, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 6915-2CS5V/GEM9 denotes a toroidal roller bearing whose 54 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 6915-2CS5V/GEM9 the 69 dimension series fixes the 105 mm OD and 54 mm width around the 75 mm bore (the bore is written directly after the slash (no bore code)); the suffix 2CS5V/GEM9 then selects the cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 75 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 54 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 105 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (54 mm) for their 105 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 6915-2CS5V/GEM9 must float; the two are designed to be used as a pair.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 204/325 kN ratings and 1400 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 6915-2CS5V/GEM9 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 75 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 54 mm roller set." }, { "q": "What are the dimensions and ratings of the C 6915-2CS5V/GEM9?", "a": "A C 6915-2CS5V/GEM9 measures 75 mm bore × 105 mm outside diameter × 54 mm width (2.953 × 4.134 × 2.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 204 kN, static C0 325 kN, fatigue limit Pu 37.5 kN, limiting speed 140 r/min, no reference speed listed, mass about 1400 g." }, { "q": "Can a CARB bearing like C 6915-2CS5V/GEM9 locate the shaft axially?", "a": "No — that is the defining feature. C 6915-2CS5V/GEM9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 6915-2CS5V/GEM9 designation read?", "a": "C = CARB toroidal family; 69 = dimension series; 75 mm (slash-size) = 75 mm bore (the bore is written directly after the slash (no bore code)); suffix 2CS5V/GEM9 selects cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C6915-V-VE240", "equiv_brand": "SKF", "level": "full", "note": "Same 75×105×54 mm ISO 15 envelope and equivalent catalogue C/C0; C 6915 V/VE240 is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C6915-2CS5V-GEM9", "C 6915-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C6915-V-VE240", "brand": "SKF", "manufacturer_designation": "C 6915 V/VE240", "series": "C6900-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 105, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 204, "static_load_kN": 325, "fatigue_load_limit_kN": 37.5, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 6915 V/VE240 denotes a toroidal roller bearing whose 54 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 6915 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V/VE240. The V suffix denotes a full complement: the toroidal rollers fill the 54 mm space without a cage, raising C to 204 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 54 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (54 mm) for their 105 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 6915 V/VE240 must float; the two are designed to be used as a pair.", "Never use C 6915 V/VE240 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 204/325 kN ratings and 1400 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 6915 V/VE240 have?", "a": "A C 6915 V/VE240 measures 75 mm bore × 105 mm outside diameter × 54 mm width (2.953 × 4.134 × 2.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 204 kN, static C0 325 kN, fatigue limit Pu 37.5 kN, limiting speed 1,900 r/min, no reference speed listed, mass about 1400 g." }, { "q": "What does C 6915 V/VE240 mean in SKF part numbering?", "a": "C marks CARB; 69 the dimension series; the size code gives 75 mm bore; V/VE240 is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 6915 V/VE240 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C6915-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "Same 75×105×54 mm ISO 15 envelope and equivalent catalogue C/C0; C 6915-2CS5V/GEM9 is the cylindrical-bore sealed full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C6915-V-VE240", "C 6915 V/VE240" ], "locale_variants": {} }, { "sku": "C4015-V", "brand": "SKF", "manufacturer_designation": "C 4015 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 115, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 208, "static_load_kN": 345, "fatigue_load_limit_kN": 40.5, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4015 V is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 75×115×40 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (15) encode the 75 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 75 mm shaft deflects; no reference speed is listed and the limiting speed is 2,000 r/min. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 2,000 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 40 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (40 mm) for their 115 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4015 V must float; the two are designed to be used as a pair.", "Never use C 4015 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 208/345 kN ratings and 1600 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 4015 V mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 75 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4015 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4015 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "24015", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×40 mm envelope as the SKF spherical roller bearing SKF 24015 CC/W33, but catalogue C/C0 differ (208/345 kN vs 181/232 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4015-V", "C 4015 V" ], "locale_variants": {} }, { "sku": "C2215", "brand": "SKF", "manufacturer_designation": "C 2215", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 196, "static_load_kN": 208, "fatigue_load_limit_kN": 24, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2215 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 75×130×31 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 2215 separates into C (CARB), 22 (dimension series), 15 (75 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 75×130×31 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 75 mm seat. The 1600 g mass over the 75×130×31 mm envelope yields about 2.61 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 75 mm seat or heat it (max 120 °C) and seat it square; never press through the 31 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (31 mm) for their 130 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2215 must float; the two are designed to be used as a pair.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 4,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 196/208 kN ratings and 1600 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (196 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2215 is the cylindrical bore for direct shaft fitting, pressed steel cage." }, { "q": "How is C 2215 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 75 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 31 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2215?", "a": "A C 2215 measures 75 mm bore × 130 mm outside diameter × 31 mm width (2.953 × 5.118 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 196 kN, static C0 208 kN, fatigue limit Pu 24 kN, reference speed 4,800 r/min, limiting speed 6,700 r/min, mass about 1600 g." }, { "q": "Can a CARB bearing like C 2215 locate the shaft axially?", "a": "No — that is the defining feature. C 2215 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C2215-K", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×31 mm ISO 15 envelope and equivalent catalogue C/C0; C 2215 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2215-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore steel-caged and cylindrical-bore full-complement V executions (196/208 kN vs 220/240 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2215-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore steel-caged and 1:12 tapered-bore K full-complement V executions (196/208 kN vs 220/240 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope as the SKF spherical roller bearing SKF 22215 E, but catalogue C/C0 differ (196/208 kN vs 217/240 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22215-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope as the SKF spherical roller bearing SKF 22215 EK, but catalogue C/C0 differ (196/208 kN vs 217/240 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2215", "C 2215" ], "locale_variants": {} }, { "sku": "C2215-K", "brand": "SKF", "manufacturer_designation": "C 2215 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 196, "static_load_kN": 208, "fatigue_load_limit_kN": 24, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2215 K belongs to the CARB family — compact aligning roller bearings: envelope 75×130×31 mm, radial rating 196/208 kN C/C0, and no axial-locating function by design. In C 2215 K the 22 dimension series fixes the 130 mm OD and 31 mm width around the 75 mm bore (code 15 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. The K suffix gives a 1:12 tapered 75 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 75×130×31 mm are identical — only the mounting method changes. Selection arithmetic: C 196 kN against C0 208 kN gives a C0/C ratio of 1.06, and the 24 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (31 mm) for their 130 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the 4,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 196/208 kN ratings belong to this exact execution (C 2215 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 2215 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 196/208 kN ratings and 1600 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2215 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2215 K?", "a": "A C 2215 K measures 75 mm bore × 130 mm outside diameter × 31 mm width (2.953 × 5.118 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 196 kN, static C0 208 kN, fatigue limit Pu 24 kN, reference speed 4,800 r/min, limiting speed 6,700 r/min, mass about 1600 g." }, { "q": "Can a CARB bearing like C 2215 K locate the shaft axially?", "a": "No — that is the defining feature. C 2215 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2215 K designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 15 = 75 mm bore (code 15 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2215", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×31 mm ISO 15 envelope and equivalent catalogue C/C0; C 2215 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2215-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K steel-caged and cylindrical-bore full-complement V executions (196/208 kN vs 220/240 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2215-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K steel-caged and 1:12 tapered-bore K full-complement V executions (196/208 kN vs 220/240 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope as the SKF spherical roller bearing SKF 22215 E, but catalogue C/C0 differ (196/208 kN vs 217/240 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22215-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope as the SKF spherical roller bearing SKF 22215 EK, but catalogue C/C0 differ (196/208 kN vs 217/240 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2215-K", "C 2215 K" ], "locale_variants": {} }, { "sku": "C2215-V", "brand": "SKF", "manufacturer_designation": "C 2215 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 220, "static_load_kN": 240, "fatigue_load_limit_kN": 28, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 1650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 2215 V in the dimension series 22 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (15) encode the 75 mm bore; suffixes describe bore and execution. The cylindrical 75 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 75×130×31 mm are identical — only the mounting method changes. Selection arithmetic: C 220 kN against C0 240 kN gives a C0/C ratio of 1.09, and the 28 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 75 mm seat or heat it (max 120 °C) and seat it square; never press through the 31 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (31 mm) for their 130 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 220/240 kN ratings belong to this exact execution (C 2215 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 220/240 kN ratings and 1650 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 2215 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2215 V have?", "a": "A C 2215 V measures 75 mm bore × 130 mm outside diameter × 31 mm width (2.953 × 5.118 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 220 kN, static C0 240 kN, fatigue limit Pu 28 kN, limiting speed 2,200 r/min, no reference speed listed, mass about 1650 g." }, { "q": "What does C 2215 V mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 75 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C2215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore steel-caged executions (220/240 kN vs 196/208 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2215-K", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K steel-caged executions (220/240 kN vs 196/208 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2215-KV", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×31 mm ISO 15 envelope and equivalent catalogue C/C0; C 2215 KV is the 1:12 tapered-bore K full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22215", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (75×130×31 mm) SKF spherical roller bearing SKF 22215 E with ratings within 10 % — not a drop-in substitute: SKF 22215 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22215-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (75×130×31 mm) SKF spherical roller bearing SKF 22215 EK with ratings within 10 % — not a drop-in substitute: SKF 22215 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2215-V", "C 2215 V" ], "locale_variants": {} }, { "sku": "C2215-KV", "brand": "SKF", "manufacturer_designation": "C 2215 KV", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 220, "static_load_kN": 240, "fatigue_load_limit_kN": 28, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 1650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2215 KV denotes a toroidal roller bearing whose 31 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (15) encode the 75 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 75 mm shaft deflects; no reference speed is listed and the limiting speed is 2,200 r/min. The 1650 g mass over the 75×130×31 mm envelope yields about 2.93 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 31 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (31 mm) for their 130 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 2215 KV as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 220/240 kN ratings belong to this exact execution (C 2215 KV); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 220/240 kN ratings and 1650 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2215 KV have?", "a": "A C 2215 KV measures 75 mm bore × 130 mm outside diameter × 31 mm width (2.953 × 5.118 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 220 kN, static C0 240 kN, fatigue limit Pu 28 kN, limiting speed 2,200 r/min, no reference speed listed, mass about 1650 g." }, { "q": "What does C 2215 KV mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 75 mm bore; KV is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2215 KV used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2215 KV sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C2215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and cylindrical-bore steel-caged executions (220/240 kN vs 196/208 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2215-K", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×31 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and 1:12 tapered-bore K steel-caged executions (220/240 kN vs 196/208 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2215-V", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×31 mm ISO 15 envelope and equivalent catalogue C/C0; C 2215 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22215", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (75×130×31 mm) SKF spherical roller bearing SKF 22215 E with ratings within 10 % — not a drop-in substitute: SKF 22215 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22215-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (75×130×31 mm) SKF spherical roller bearing SKF 22215 EK with ratings within 10 % — not a drop-in substitute: SKF 22215 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2215-KV", "C 2215 KV" ], "locale_variants": {} }, { "sku": "C2315", "brand": "SKF", "manufacturer_designation": "C 2315", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 425, "static_load_kN": 465, "fatigue_load_limit_kN": 52, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 5300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2315 belongs to the CARB family — compact aligning roller bearings: envelope 75×160×55 mm, radial rating 425/465 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (23) identify the ISO dimension series and the last two (15) encode the 75 mm bore; suffixes describe bore and execution. The cylindrical 75 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 75×160×55 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 55 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 75 mm seat or heat it (max 120 °C) and seat it square; never press through the 55 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (55 mm) for their 160 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 425/465 kN ratings belong to this exact execution (C 2315); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 3,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 425/465 kN ratings and 5300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 2315 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2315 have?", "a": "A C 2315 measures 75 mm bore × 160 mm outside diameter × 55 mm width (2.953 × 6.299 × 2.165 in). From SKF catalogue PUB BU/P1 17000: dynamic C 425 kN, static C0 465 kN, fatigue limit Pu 52 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 5300 g." }, { "q": "What does C 2315 mean in SKF part numbering?", "a": "C marks CARB; 23 the dimension series; the size code gives 75 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C2315-K", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×55 mm ISO 15 envelope and equivalent catalogue C/C0; C 2315 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22315", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (75×160×55 mm) SKF spherical roller bearing SKF 22315 E with ratings within 10 % — not a drop-in substitute: SKF 22315 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22315-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (75×160×55 mm) SKF spherical roller bearing SKF 22315 EK with ratings within 10 % — not a drop-in substitute: SKF 22315 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2315", "C 2315" ], "locale_variants": {} }, { "sku": "C2315-K", "brand": "SKF", "manufacturer_designation": "C 2315 K", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 425, "static_load_kN": 465, "fatigue_load_limit_kN": 52, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 5300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2315 K is the dimension series 23 CARB toroidal roller bearings member of the CARB range: 75 mm bore, 160 mm OD, 55 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 2315 K the 23 dimension series fixes the 160 mm OD and 55 mm width around the 75 mm bore (code 15 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 75 mm seat. The 5300 g mass over the 75×160×55 mm envelope yields about 5.67 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 55 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 75 mm bore the small CARB executions are unusually wide (55 mm) for their 160 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Never use C 2315 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 75 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 3,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 425/465 kN ratings belong to this exact execution (C 2315 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 425/465 kN ratings and 5300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 2315 K?", "a": "A C 2315 K measures 75 mm bore × 160 mm outside diameter × 55 mm width (2.953 × 6.299 × 2.165 in). From SKF catalogue PUB BU/P1 17000: dynamic C 425 kN, static C0 465 kN, fatigue limit Pu 52 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 5300 g." }, { "q": "Can a CARB bearing like C 2315 K locate the shaft axially?", "a": "No — that is the defining feature. C 2315 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2315 K designation read?", "a": "C = CARB toroidal family; 23 = dimension series; 15 = 75 mm bore (code 15 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (425 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2315 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C2315", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×55 mm ISO 15 envelope and equivalent catalogue C/C0; C 2315 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22315", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (75×160×55 mm) SKF spherical roller bearing SKF 22315 E with ratings within 10 % — not a drop-in substitute: SKF 22315 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22315-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (75×160×55 mm) SKF spherical roller bearing SKF 22315 EK with ratings within 10 % — not a drop-in substitute: SKF 22315 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2315-K", "C 2315 K" ], "locale_variants": {} }, { "sku": "C2216", "brand": "SKF", "manufacturer_designation": "C 2216", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 220, "static_load_kN": 250, "fatigue_load_limit_kN": 28.5, "reference_speed_rpm": 4300, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 2050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 2216 in the dimension series 22 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (16) encode the 80 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 80 mm seat. The 2050 g mass over the 80×140×33 mm envelope yields about 2.75 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 80 mm bore the small CARB executions are unusually wide (33 mm) for their 140 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "The quoted 220/250 kN ratings belong to this exact execution (C 2216); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Reference and limiting speeds are different limits: the 4,300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 2216 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 220/250 kN ratings and 2050 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 2216 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2216 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2216 have?", "a": "A C 2216 measures 80 mm bore × 140 mm outside diameter × 33 mm width (3.15 × 5.512 × 1.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 220 kN, static C0 250 kN, fatigue limit Pu 28.5 kN, reference speed 4,300 r/min, limiting speed 6,000 r/min, mass about 2050 g." } ], "cross_ref": [ { "equiv_sku": "C2216-K", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×33 mm ISO 15 envelope and equivalent catalogue C/C0; C 2216 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2216-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope, but catalogue C/C0 differ between the cylindrical-bore steel-caged and cylindrical-bore full-complement V executions (220/250 kN vs 255/305 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2216-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope, but catalogue C/C0 differ between the cylindrical-bore steel-caged and 1:12 tapered-bore K full-complement V executions (220/250 kN vs 255/305 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope as the SKF spherical roller bearing SKF 22216 E, but catalogue C/C0 differ (220/250 kN vs 243/270 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22216-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope as the SKF spherical roller bearing SKF 22216 EK, but catalogue C/C0 differ (220/250 kN vs 243/270 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2216", "C 2216" ], "locale_variants": {} }, { "sku": "C2216-K", "brand": "SKF", "manufacturer_designation": "C 2216 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 220, "static_load_kN": 250, "fatigue_load_limit_kN": 28.5, "reference_speed_rpm": 4300, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 2050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 2216 K in the dimension series 22 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 2216 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 80×140 mm size with 220 kN dynamic and a 4,300 r/min reference speed. Speed planning separates the 4,300 r/min thermal reference from the 6,000 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 80 mm bore the small CARB executions are unusually wide (33 mm) for their 140 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 80 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 4,300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 220/250 kN ratings belong to this exact execution (C 2216 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 2216 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 220/250 kN ratings and 2050 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2216 K have?", "a": "A C 2216 K measures 80 mm bore × 140 mm outside diameter × 33 mm width (3.15 × 5.512 × 1.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 220 kN, static C0 250 kN, fatigue limit Pu 28.5 kN, reference speed 4,300 r/min, limiting speed 6,000 r/min, mass about 2050 g." }, { "q": "What does C 2216 K mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 80 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2216 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C2216", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×33 mm ISO 15 envelope and equivalent catalogue C/C0; C 2216 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C2216-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K steel-caged and cylindrical-bore full-complement V executions (220/250 kN vs 255/305 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2216-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K steel-caged and 1:12 tapered-bore K full-complement V executions (220/250 kN vs 255/305 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "22216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope as the SKF spherical roller bearing SKF 22216 E, but catalogue C/C0 differ (220/250 kN vs 243/270 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22216-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope as the SKF spherical roller bearing SKF 22216 EK, but catalogue C/C0 differ (220/250 kN vs 243/270 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2216-K", "C 2216 K" ], "locale_variants": {} }, { "sku": "C2216-V", "brand": "SKF", "manufacturer_designation": "C 2216 V", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 255, "static_load_kN": 305, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2216 V: the toroidal rollers allow the 80 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 2216 V the 22 dimension series fixes the 140 mm OD and 33 mm width around the 80 mm bore (code 16 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The V suffix denotes a full complement: the toroidal rollers fill the 33 mm space without a cage, raising C to 255 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 2,000 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 80 mm seat or heat it (max 120 °C) and seat it square; never press through the 33 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 80 mm bore the small CARB executions are unusually wide (33 mm) for their 140 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 255/305 kN ratings belong to this exact execution (C 2216 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 80 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Never use C 2216 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 255/305 kN ratings and 2150 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (255 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2216 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 2216 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 80 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 33 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2216 V?", "a": "A C 2216 V measures 80 mm bore × 140 mm outside diameter × 33 mm width (3.15 × 5.512 × 1.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 255 kN, static C0 305 kN, fatigue limit Pu 34.5 kN, limiting speed 2,000 r/min, no reference speed listed, mass about 2150 g." }, { "q": "Can a CARB bearing like C 2216 V locate the shaft axially?", "a": "No — that is the defining feature. C 2216 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C2216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore steel-caged executions (255/305 kN vs 220/250 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2216-K", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:12 tapered-bore K steel-caged executions (255/305 kN vs 220/250 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2216-KV", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×33 mm ISO 15 envelope and equivalent catalogue C/C0; C 2216 KV is the 1:12 tapered-bore K full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope as the SKF spherical roller bearing SKF 22216 E, but catalogue C/C0 differ (255/305 kN vs 243/270 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22216-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope as the SKF spherical roller bearing SKF 22216 EK, but catalogue C/C0 differ (255/305 kN vs 243/270 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2216-V", "C 2216 V" ], "locale_variants": {} }, { "sku": "C2216-KV", "brand": "SKF", "manufacturer_designation": "C 2216 KV", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 255, "static_load_kN": 305, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 2216 KV in the dimension series 22 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 2216 KV the 22 dimension series fixes the 140 mm OD and 33 mm width around the 80 mm bore (code 16 × 5); the suffix KV then selects the tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage). The V suffix denotes a full complement: the toroidal rollers fill the 33 mm space without a cage, raising C to 255 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Selection arithmetic: C 255 kN against C0 305 kN gives a C0/C ratio of 1.20, and the 34.5 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 140 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 80 mm bore the small CARB executions are unusually wide (33 mm) for their 140 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 255/305 kN ratings belong to this exact execution (C 2216 KV); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 2216 KV as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 255/305 kN ratings and 2150 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2216 KV mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2216 KV?", "a": "A C 2216 KV measures 80 mm bore × 140 mm outside diameter × 33 mm width (3.15 × 5.512 × 1.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 255 kN, static C0 305 kN, fatigue limit Pu 34.5 kN, limiting speed 2,000 r/min, no reference speed listed, mass about 2150 g." }, { "q": "Can a CARB bearing like C 2216 KV locate the shaft axially?", "a": "No — that is the defining feature. C 2216 KV deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2216 KV designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 16 = 80 mm bore (code 16 × 5); suffix KV selects tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and cylindrical-bore steel-caged executions (255/305 kN vs 220/250 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2216-K", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and 1:12 tapered-bore K steel-caged executions (255/305 kN vs 220/250 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C2216-V", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×33 mm ISO 15 envelope and equivalent catalogue C/C0; C 2216 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope as the SKF spherical roller bearing SKF 22216 E, but catalogue C/C0 differ (255/305 kN vs 243/270 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22216-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×33 mm envelope as the SKF spherical roller bearing SKF 22216 EK, but catalogue C/C0 differ (255/305 kN vs 243/270 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2216-KV", "C 2216 KV" ], "locale_variants": {} }, { "sku": "C2316", "brand": "SKF", "manufacturer_designation": "C 2316", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 510, "static_load_kN": 550, "fatigue_load_limit_kN": 60, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 6300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2316: the toroidal rollers allow the 80 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 2316 the 23 dimension series fixes the 170 mm OD and 58 mm width around the 80 mm bore (code 16 × 5); the suffix the bare number then selects the cylindrical bore for direct shaft fitting, pressed steel cage. The cylindrical 80 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 80×170×58 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 58 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 80 mm bore the small CARB executions are unusually wide (58 mm) for their 170 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Reference and limiting speeds are different limits: the 3,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 510/550 kN ratings belong to this exact execution (C 2316); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 2316 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 80 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 510/550 kN ratings and 6300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 2316 designation read?", "a": "C = CARB toroidal family; 23 = dimension series; 16 = 80 mm bore (code 16 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (510 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2316 is the cylindrical bore for direct shaft fitting, pressed steel cage." }, { "q": "How is C 2316 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 80 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 58 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2316?", "a": "A C 2316 measures 80 mm bore × 170 mm outside diameter × 58 mm width (3.15 × 6.693 × 2.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 510 kN, static C0 550 kN, fatigue limit Pu 60 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 6300 g." } ], "cross_ref": [ { "equiv_sku": "C2316-K", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×58 mm ISO 15 envelope and equivalent catalogue C/C0; C 2316 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22316", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (80×170×58 mm) SKF spherical roller bearing SKF 22316 E with ratings within 10 % — not a drop-in substitute: SKF 22316 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22316-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (80×170×58 mm) SKF spherical roller bearing SKF 22316 EK with ratings within 10 % — not a drop-in substitute: SKF 22316 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2316", "C 2316" ], "locale_variants": {} }, { "sku": "C2316-K", "brand": "SKF", "manufacturer_designation": "C 2316 K", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 510, "static_load_kN": 550, "fatigue_load_limit_kN": 60, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 6300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2316 K denotes a toroidal roller bearing whose 58 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 2316 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The K suffix gives a 1:12 tapered 80 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 80×170×58 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 58 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 58 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 80 mm bore the small CARB executions are unusually wide (58 mm) for their 170 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2316 K must float; the two are designed to be used as a pair.", "Never use C 2316 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 80 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 3,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 510/550 kN ratings and 6300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2316 K have?", "a": "A C 2316 K measures 80 mm bore × 170 mm outside diameter × 58 mm width (3.15 × 6.693 × 2.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 510 kN, static C0 550 kN, fatigue limit Pu 60 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 6300 g." }, { "q": "What does C 2316 K mean in SKF part numbering?", "a": "C marks CARB; 23 the dimension series; the size code gives 80 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2316 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2316 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C2316", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×58 mm ISO 15 envelope and equivalent catalogue C/C0; C 2316 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22316", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (80×170×58 mm) SKF spherical roller bearing SKF 22316 E with ratings within 10 % — not a drop-in substitute: SKF 22316 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22316-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (80×170×58 mm) SKF spherical roller bearing SKF 22316 EK with ratings within 10 % — not a drop-in substitute: SKF 22316 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2316-K", "C 2316 K" ], "locale_variants": {} }, { "sku": "C2217", "brand": "SKF", "manufacturer_designation": "C 2217", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 275, "static_load_kN": 320, "fatigue_load_limit_kN": 35.5, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 2650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2217 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 85 mm bore, 150 mm outside diameter, 36 mm wide unit rated 275 kN dynamic. In C 2217 the 22 dimension series fixes the 150 mm OD and 36 mm width around the 85 mm bore (code 17 × 5); the suffix the bare number then selects the cylindrical bore for direct shaft fitting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 85 mm seat. The 2650 g mass over the 85×150×36 mm envelope yields about 3.24 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 150 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 85 mm bore, shaft expansion is already measurable: calculate the required float inside the 36 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the 4,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 275/320 kN ratings belong to this exact execution (C 2217); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 2217 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 275/320 kN ratings and 2650 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 2217 locate the shaft axially?", "a": "No — that is the defining feature. C 2217 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2217 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 17 = 85 mm bore (code 17 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (275 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2217 is the cylindrical bore for direct shaft fitting, pressed steel cage." }, { "q": "How is C 2217 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 85 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 36 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C2217-K", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×36 mm ISO 15 envelope and equivalent catalogue C/C0; C 2217 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22217", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (85×150×36 mm) SKF spherical roller bearing SKF 22217 E with ratings within 10 % — not a drop-in substitute: SKF 22217 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22217-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (85×150×36 mm) SKF spherical roller bearing SKF 22217 EK with ratings within 10 % — not a drop-in substitute: SKF 22217 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2217", "C 2217" ], "locale_variants": {} }, { "sku": "C2217-K", "brand": "SKF", "manufacturer_designation": "C 2217 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 275, "static_load_kN": 320, "fatigue_load_limit_kN": 35.5, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 2650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2217 K: the toroidal rollers allow the 85 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (17) encode the 85 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 85 mm shaft deflects; the 4,000 r/min reference and 5,600 r/min limiting speed are both catalogue values. Speed planning separates the 4,000 r/min thermal reference from the 5,600 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 85 mm bore, shaft expansion is already measurable: calculate the required float inside the 36 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2217 K must float; the two are designed to be used as a pair.", "Never use C 2217 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Reference and limiting speeds are different limits: the 4,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 275/320 kN ratings belong to this exact execution (C 2217 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 275/320 kN ratings and 2650 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2217 K have?", "a": "A C 2217 K measures 85 mm bore × 150 mm outside diameter × 36 mm width (3.346 × 5.906 × 1.417 in). From SKF catalogue PUB BU/P1 17000: dynamic C 275 kN, static C0 320 kN, fatigue limit Pu 35.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 2650 g." }, { "q": "What does C 2217 K mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 85 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2217 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C2217", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×36 mm ISO 15 envelope and equivalent catalogue C/C0; C 2217 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22217", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (85×150×36 mm) SKF spherical roller bearing SKF 22217 E with ratings within 10 % — not a drop-in substitute: SKF 22217 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22217-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (85×150×36 mm) SKF spherical roller bearing SKF 22217 EK with ratings within 10 % — not a drop-in substitute: SKF 22217 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2217-K", "C 2217 K" ], "locale_variants": {} }, { "sku": "C2317", "brand": "SKF", "manufacturer_designation": "C 2317", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 540, "static_load_kN": 600, "fatigue_load_limit_kN": 64, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 7400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2317 is the dimension series 23 CARB toroidal roller bearings member of the CARB range: 85 mm bore, 180 mm OD, 60 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 2317 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here the bare number. The cylindrical 85 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 85×180×60 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 60 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 180 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 85 mm bore, shaft expansion is already measurable: calculate the required float inside the 60 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 85 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 3,200 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 540/600 kN ratings belong to this exact execution (C 2317); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 540/600 kN ratings and 7400 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 2317 mean in SKF part numbering?", "a": "C marks CARB; 23 the dimension series; the size code gives 85 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2317 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2317 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C2317-K", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×60 mm ISO 15 envelope and equivalent catalogue C/C0; C 2317 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22317", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (85×180×60 mm) SKF spherical roller bearing SKF 22317 E with ratings within 10 % — not a drop-in substitute: SKF 22317 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22317-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (85×180×60 mm) SKF spherical roller bearing SKF 22317 EK with ratings within 10 % — not a drop-in substitute: SKF 22317 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2317", "C 2317" ], "locale_variants": {} }, { "sku": "C2317-K", "brand": "SKF", "manufacturer_designation": "C 2317 K", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 540, "static_load_kN": 600, "fatigue_load_limit_kN": 64, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 7400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2317 K is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 85×180×60 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 2317 K separates into C (CARB), 23 (dimension series), 17 (85 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 85×180×60 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 85×180 mm size with 540 kN dynamic and a 3,200 r/min reference speed. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2317 K deliberately carries none. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 60 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 85 mm bore, shaft expansion is already measurable: calculate the required float inside the 60 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2317 K must float; the two are designed to be used as a pair.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 85 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 3,200 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 540/600 kN ratings and 7400 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 2317 K?", "a": "A C 2317 K measures 85 mm bore × 180 mm outside diameter × 60 mm width (3.346 × 7.087 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 540 kN, static C0 600 kN, fatigue limit Pu 64 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 7400 g." }, { "q": "Can a CARB bearing like C 2317 K locate the shaft axially?", "a": "No — that is the defining feature. C 2317 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2317 K designation read?", "a": "C = CARB toroidal family; 23 = dimension series; 17 = 85 mm bore (code 17 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (540 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2317 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C2317", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×60 mm ISO 15 envelope and equivalent catalogue C/C0; C 2317 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22317", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (85×180×60 mm) SKF spherical roller bearing SKF 22317 E with ratings within 10 % — not a drop-in substitute: SKF 22317 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22317-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (85×180×60 mm) SKF spherical roller bearing SKF 22317 EK with ratings within 10 % — not a drop-in substitute: SKF 22317 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2317-K", "C 2317 K" ], "locale_variants": {} }, { "sku": "C5918-MB", "brand": "SKF", "manufacturer_designation": "C 5918 MB", "series": "C5900-series", "type": "carb_toroidal", "d_mm": 90, "D_mm": 125, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 193, "static_load_kN": 325, "fatigue_load_limit_kN": 37.5, "reference_speed_rpm": 2600, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 5918 MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 90 mm bore, 125 mm outside diameter, 46 mm wide unit rated 193 kN dynamic. The designation C 5918 MB separates into C (CARB), 59 (dimension series), 18 (90 mm bore) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 90×125×46 mm follows the ISO 15 plan. The MB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. The 1750 g mass over the 90×125×46 mm envelope yields about 2.14 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 125 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 90 mm bore, shaft expansion is already measurable: calculate the required float inside the 46 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 5918 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 90 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 193/325 kN ratings belong to this exact execution (C 5918 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 193/325 kN ratings and 1750 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 5918 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 90 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 46 mm roller set." }, { "q": "What are the dimensions and ratings of the C 5918 MB?", "a": "A C 5918 MB measures 90 mm bore × 125 mm outside diameter × 46 mm width (3.543 × 4.921 × 1.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 193 kN, static C0 325 kN, fatigue limit Pu 37.5 kN, reference speed 2,600 r/min, limiting speed 4,000 r/min, mass about 1750 g." }, { "q": "Can a CARB bearing like C 5918 MB locate the shaft axially?", "a": "No — that is the defining feature. C 5918 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 5918 MB designation read?", "a": "C = CARB toroidal family; 59 = dimension series; 18 = 90 mm bore (code 18 × 5); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C5918-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×46 mm envelope, but catalogue C/C0 differ between the cylindrical-bore MB inner-ring-guided brass-caged and cylindrical-bore sealed full-complement V executions (193/325 kN vs 224/400 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C5918-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×46 mm envelope, but catalogue C/C0 differ between the cylindrical-bore MB inner-ring-guided brass-caged and cylindrical-bore full-complement V executions (193/325 kN vs 224/400 kN) — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C5918-MB", "C 5918 MB" ], "locale_variants": {} }, { "sku": "C5918-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 5918-2CS5V/GEM9", "series": "C5900-series", "type": "carb_toroidal", "d_mm": 90, "D_mm": 125, "B_mm": 46, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 224, "static_load_kN": 400, "fatigue_load_limit_kN": 44, "limiting_speed_rpm": 110, "max_rpm": 110, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 5918-2CS5V/GEM9 belongs to the CARB family — compact aligning roller bearings: envelope 90×125×46 mm, radial rating 224/400 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 5918 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here 2CS5V/GEM9. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 90 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 5918-2CS5V/GEM9 deliberately carries none. Sealed executions arrive greased for life: do not wash out the factory fill, and mount seals-clear of the housing shoulder edges. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 46 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 90 mm bore, shaft expansion is already measurable: calculate the required float inside the 46 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 90 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 5918-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 224/400 kN ratings belong to this exact execution (C 5918-2CS5V/GEM9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 224/400 kN ratings and 1750 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 5918-2CS5V/GEM9 sealed?", "a": "Yes — this is a sealed full-complement execution (2CS5V contact seals with annular groove), greased at the factory; the catalogue lists no reference speed and the limiting speed is 110 r/min." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 5918-2CS5V/GEM9 have?", "a": "A C 5918-2CS5V/GEM9 measures 90 mm bore × 125 mm outside diameter × 46 mm width (3.543 × 4.921 × 1.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 224 kN, static C0 400 kN, fatigue limit Pu 44 kN, limiting speed 110 r/min, no reference speed listed, mass about 1750 g." }, { "q": "What does C 5918-2CS5V/GEM9 mean in SKF part numbering?", "a": "C marks CARB; 59 the dimension series; the size code gives 90 mm bore; 2CS5V/GEM9 is the execution (cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C5918-MB", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×46 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore MB inner-ring-guided brass-caged executions (224/400 kN vs 193/325 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C5918-V", "equiv_brand": "SKF", "level": "full", "note": "Same 90×125×46 mm ISO 15 envelope and equivalent catalogue C/C0; C 5918 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C5918-2CS5V-GEM9", "C 5918-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C5918-V", "brand": "SKF", "manufacturer_designation": "C 5918 V", "series": "C5900-series", "type": "carb_toroidal", "d_mm": 90, "D_mm": 125, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 224, "static_load_kN": 400, "fatigue_load_limit_kN": 45.5, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 5918 V belongs to the CARB family — compact aligning roller bearings: envelope 90×125×46 mm, radial rating 224/400 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 5918 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 90 mm shaft deflects; no reference speed is listed and the limiting speed is 1,600 r/min. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 46 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 125 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 90 mm bore, shaft expansion is already measurable: calculate the required float inside the 46 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 224/400 kN ratings belong to this exact execution (C 5918 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 5918 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 90 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 224/400 kN ratings and 1750 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 5918 V mean in SKF part numbering?", "a": "C marks CARB; 59 the dimension series; the size code gives 90 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 5918 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 5918 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C5918-MB", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×46 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore MB inner-ring-guided brass-caged executions (224/400 kN vs 193/325 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C5918-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "Same 90×125×46 mm ISO 15 envelope and equivalent catalogue C/C0; C 5918-2CS5V/GEM9 is the cylindrical-bore sealed full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C5918-V", "C 5918 V" ], "locale_variants": {} }, { "sku": "C2218", "brand": "SKF", "manufacturer_designation": "C 2218", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 380, "fatigue_load_limit_kN": 41.5, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 3300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2218 denotes a toroidal roller bearing whose 40 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 2218 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here the bare number. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 90 mm seat. The 3300 g mass over the 90×160×40 mm envelope yields about 3.61 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 40 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 90 mm bore, shaft expansion is already measurable: calculate the required float inside the 40 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 90 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 3,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2218 must float; the two are designed to be used as a pair.", "The 325/380 kN ratings and 3300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2218 have?", "a": "A C 2218 measures 90 mm bore × 160 mm outside diameter × 40 mm width (3.543 × 6.299 × 1.575 in). From SKF catalogue PUB BU/P1 17000: dynamic C 325 kN, static C0 380 kN, fatigue limit Pu 41.5 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 3300 g." }, { "q": "What does C 2218 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 90 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2218 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2218 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C2218-K", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×40 mm ISO 15 envelope and equivalent catalogue C/C0; C 2218 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22218", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (90×160×40 mm) SKF spherical roller bearing SKF 22218 E with ratings within 10 % — not a drop-in substitute: SKF 22218 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22218-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (90×160×40 mm) SKF spherical roller bearing SKF 22218 EK with ratings within 10 % — not a drop-in substitute: SKF 22218 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2218", "C 2218" ], "locale_variants": {} }, { "sku": "C2218-K", "brand": "SKF", "manufacturer_designation": "C 2218 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 380, "fatigue_load_limit_kN": 41.5, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 3300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2218 K combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 90 mm bore, 160 mm outside diameter, 40 mm wide unit rated 325 kN dynamic. In C 2218 K the 22 dimension series fixes the 160 mm OD and 40 mm width around the 90 mm bore (code 18 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 90 mm seat. The 3300 g mass over the 90×160×40 mm envelope yields about 3.61 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 90 mm bore, shaft expansion is already measurable: calculate the required float inside the 40 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2218 K must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the 3,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 325/380 kN ratings belong to this exact execution (C 2218 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 325/380 kN ratings and 3300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2218 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2218 K?", "a": "A C 2218 K measures 90 mm bore × 160 mm outside diameter × 40 mm width (3.543 × 6.299 × 1.575 in). From SKF catalogue PUB BU/P1 17000: dynamic C 325 kN, static C0 380 kN, fatigue limit Pu 41.5 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 3300 g." }, { "q": "Can a CARB bearing like C 2218 K locate the shaft axially?", "a": "No — that is the defining feature. C 2218 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2218 K designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 18 = 90 mm bore (code 18 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2218", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×40 mm ISO 15 envelope and equivalent catalogue C/C0; C 2218 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22218", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (90×160×40 mm) SKF spherical roller bearing SKF 22218 E with ratings within 10 % — not a drop-in substitute: SKF 22218 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22218-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (90×160×40 mm) SKF spherical roller bearing SKF 22218 EK with ratings within 10 % — not a drop-in substitute: SKF 22218 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2218-K", "C 2218 K" ], "locale_variants": {} }, { "sku": "C2318", "brand": "SKF", "manufacturer_designation": "C 2318", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 610, "static_load_kN": 695, "fatigue_load_limit_kN": 73.5, "reference_speed_rpm": 2800, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 8650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2318 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 90×190×64 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 2318 separates into C (CARB), 23 (dimension series), 18 (90 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 90×190×64 mm follows the ISO 15 plan. The cylindrical 90 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 90×190×64 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 64 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 64 mm wide cavity does not fill itself.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 90 mm bore, shaft expansion is already measurable: calculate the required float inside the 64 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 2318 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 90 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2318 must float; the two are designed to be used as a pair.", "The 610/695 kN ratings and 8650 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 2318?", "a": "A C 2318 measures 90 mm bore × 190 mm outside diameter × 64 mm width (3.543 × 7.48 × 2.52 in). From SKF catalogue PUB BU/P1 17000: dynamic C 610 kN, static C0 695 kN, fatigue limit Pu 73.5 kN, reference speed 2,800 r/min, limiting speed 4,000 r/min, mass about 8650 g." }, { "q": "Can a CARB bearing like C 2318 locate the shaft axially?", "a": "No — that is the defining feature. C 2318 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2318 designation read?", "a": "C = CARB toroidal family; 23 = dimension series; 18 = 90 mm bore (code 18 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (610 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2318 is the cylindrical bore for direct shaft fitting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C2318-K", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×64 mm ISO 15 envelope and equivalent catalogue C/C0; C 2318 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22318", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (90×190×64 mm) SKF spherical roller bearing SKF 22318 E with ratings within 10 % — not a drop-in substitute: SKF 22318 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22318-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (90×190×64 mm) SKF spherical roller bearing SKF 22318 EK with ratings within 10 % — not a drop-in substitute: SKF 22318 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2318", "C 2318" ], "locale_variants": {} }, { "sku": "C2318-K", "brand": "SKF", "manufacturer_designation": "C 2318 K", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 610, "static_load_kN": 695, "fatigue_load_limit_kN": 73.5, "reference_speed_rpm": 2800, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 8650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2318 K belongs to the CARB family — compact aligning roller bearings: envelope 90×190×64 mm, radial rating 610/695 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (23) identify the ISO dimension series and the last two (18) encode the 90 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 90 mm shaft deflects; the 2,800 r/min reference and 4,000 r/min limiting speed are both catalogue values. Selection arithmetic: C 610 kN against C0 695 kN gives a C0/C ratio of 1.14, and the 73.5 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 64 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 90 mm bore, shaft expansion is already measurable: calculate the required float inside the 64 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 610/695 kN ratings belong to this exact execution (C 2318 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 90 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 610/695 kN ratings and 8650 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2318 K have?", "a": "A C 2318 K measures 90 mm bore × 190 mm outside diameter × 64 mm width (3.543 × 7.48 × 2.52 in). From SKF catalogue PUB BU/P1 17000: dynamic C 610 kN, static C0 695 kN, fatigue limit Pu 73.5 kN, reference speed 2,800 r/min, limiting speed 4,000 r/min, mass about 8650 g." }, { "q": "What does C 2318 K mean in SKF part numbering?", "a": "C marks CARB; 23 the dimension series; the size code gives 90 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2318 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2318 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C2318", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×64 mm ISO 15 envelope and equivalent catalogue C/C0; C 2318 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22318", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (90×190×64 mm) SKF spherical roller bearing SKF 22318 E with ratings within 10 % — not a drop-in substitute: SKF 22318 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22318-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (90×190×64 mm) SKF spherical roller bearing SKF 22318 EK with ratings within 10 % — not a drop-in substitute: SKF 22318 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2318-K", "C 2318 K" ], "locale_variants": {} }, { "sku": "C2319", "brand": "SKF", "manufacturer_designation": "C 2319", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 610, "static_load_kN": 695, "fatigue_load_limit_kN": 73.5, "reference_speed_rpm": 2800, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 2319 in the dimension series 23 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (23) identify the ISO dimension series and the last two (19) encode the 95 mm bore; suffixes describe bore and execution. The cylindrical 95 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 95×200×67 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 67 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 95 mm seat or heat it (max 120 °C) and seat it square; never press through the 67 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 95 mm bore, shaft expansion is already measurable: calculate the required float inside the 67 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2319 must float; the two are designed to be used as a pair.", "Never use C 2319 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 95 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 610/695 kN ratings and 10000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2319 have?", "a": "A C 2319 measures 95 mm bore × 200 mm outside diameter × 67 mm width (3.74 × 7.874 × 2.638 in). From SKF catalogue PUB BU/P1 17000: dynamic C 610 kN, static C0 695 kN, fatigue limit Pu 73.5 kN, reference speed 2,800 r/min, limiting speed 4,000 r/min, mass about 10000 g." }, { "q": "What does C 2319 mean in SKF part numbering?", "a": "C marks CARB; 23 the dimension series; the size code gives 95 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2319 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C2319-K", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×67 mm ISO 15 envelope and equivalent catalogue C/C0; C 2319 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22319", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×67 mm envelope as the SKF spherical roller bearing SKF 22319 E, but catalogue C/C0 differ (610/695 kN vs 699/765 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22319-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×67 mm envelope as the SKF spherical roller bearing SKF 22319 EK, but catalogue C/C0 differ (610/695 kN vs 699/765 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2319", "C 2319" ], "locale_variants": {} }, { "sku": "C2319-K", "brand": "SKF", "manufacturer_designation": "C 2319 K", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 610, "static_load_kN": 695, "fatigue_load_limit_kN": 73.5, "reference_speed_rpm": 2800, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2319 K denotes a toroidal roller bearing whose 67 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 2319 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The K suffix gives a 1:12 tapered 95 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 95×200×67 mm are identical — only the mounting method changes. Selection arithmetic: C 610 kN against C0 695 kN gives a C0/C ratio of 1.14, and the 73.5 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 200 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 95 mm bore, shaft expansion is already measurable: calculate the required float inside the 67 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 95 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 2319 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 610/695 kN ratings belong to this exact execution (C 2319 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 610/695 kN ratings and 10000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2319 K have?", "a": "A C 2319 K measures 95 mm bore × 200 mm outside diameter × 67 mm width (3.74 × 7.874 × 2.638 in). From SKF catalogue PUB BU/P1 17000: dynamic C 610 kN, static C0 695 kN, fatigue limit Pu 73.5 kN, reference speed 2,800 r/min, limiting speed 4,000 r/min, mass about 10000 g." }, { "q": "What does C 2319 K mean in SKF part numbering?", "a": "C marks CARB; 23 the dimension series; the size code gives 95 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2319 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2319 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C2319", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×67 mm ISO 15 envelope and equivalent catalogue C/C0; C 2319 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22319", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×67 mm envelope as the SKF spherical roller bearing SKF 22319 E, but catalogue C/C0 differ (610/695 kN vs 699/765 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22319-EK", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×67 mm envelope as the SKF spherical roller bearing SKF 22319 EK, but catalogue C/C0 differ (610/695 kN vs 699/765 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2319-K", "C 2319 K" ], "locale_variants": {} }, { "sku": "C4020-V", "brand": "SKF", "manufacturer_designation": "C 4020 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 100, "D_mm": 150, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 355, "static_load_kN": 530, "fatigue_load_limit_kN": 58.5, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 3050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4020 V is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 100 mm bore, 150 mm OD, 50 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 4020 V separates into C (CARB), 40 (dimension series), 20 (100 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 100×150×50 mm follows the ISO 15 plan. The V suffix denotes a full complement: the toroidal rollers fill the 50 mm space without a cage, raising C to 355 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 4020 V deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 100 mm bore, shaft expansion is already measurable: calculate the required float inside the 50 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 4020 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 100 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 355/530 kN ratings belong to this exact execution (C 4020 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 355/530 kN ratings and 3050 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 4020 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 100 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 50 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4020 V?", "a": "A C 4020 V measures 100 mm bore × 150 mm outside diameter × 50 mm width (3.937 × 5.906 × 1.969 in). From SKF catalogue PUB BU/P1 17000: dynamic C 355 kN, static C0 530 kN, fatigue limit Pu 58.5 kN, limiting speed 1,400 r/min, no reference speed listed, mass about 3050 g." }, { "q": "Can a CARB bearing like C 4020 V locate the shaft axially?", "a": "No — that is the defining feature. C 4020 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4020 V designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 20 = 100 mm bore (code 20 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "24020", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×150×50 mm envelope as the SKF spherical roller bearing SKF 24020 CC/W33, but catalogue C/C0 differ (355/530 kN vs 296/415 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4020-V", "C 4020 V" ], "locale_variants": {} }, { "sku": "C5020-V", "brand": "SKF", "manufacturer_designation": "C 5020 V", "series": "C5000-series", "type": "carb_toroidal", "d_mm": 100, "D_mm": 150, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 510, "static_load_kN": 865, "fatigue_load_limit_kN": 95, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 4300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 5020 V denotes a toroidal roller bearing whose 67 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 5020 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 100 mm shaft deflects; no reference speed is listed and the limiting speed is 1,100 r/min. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 67 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 100 mm bore, shaft expansion is already measurable: calculate the required float inside the 67 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 510/865 kN ratings belong to this exact execution (C 5020 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 5020 V must float; the two are designed to be used as a pair.", "Never use C 5020 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 510/865 kN ratings and 4300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 5020 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 5020 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 5020 V have?", "a": "A C 5020 V measures 100 mm bore × 150 mm outside diameter × 67 mm width (3.937 × 5.906 × 2.638 in). From SKF catalogue PUB BU/P1 17000: dynamic C 510 kN, static C0 865 kN, fatigue limit Pu 95 kN, limiting speed 1,100 r/min, no reference speed listed, mass about 4300 g." } ], "cross_ref": [ { "equiv_sku": "C5020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C5020-V", "C 5020 V" ], "locale_variants": {} }, { "sku": "C3120-V", "brand": "SKF", "manufacturer_designation": "C 3120 V", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 100, "D_mm": 165, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 475, "static_load_kN": 655, "fatigue_load_limit_kN": 71, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 4450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3120 V combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 100 mm bore, 165 mm outside diameter, 52 mm wide unit rated 475 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 3120 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The V suffix denotes a full complement: the toroidal rollers fill the 52 mm space without a cage, raising C to 475 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Selection arithmetic: C 475 kN against C0 655 kN gives a C0/C ratio of 1.38, and the 71 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 52 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 100 mm bore, shaft expansion is already measurable: calculate the required float inside the 52 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 475/655 kN ratings belong to this exact execution (C 3120 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 3120 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 100 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 475/655 kN ratings and 4450 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 3120 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3120 V have?", "a": "A C 3120 V measures 100 mm bore × 165 mm outside diameter × 52 mm width (3.937 × 6.496 × 2.047 in). From SKF catalogue PUB BU/P1 17000: dynamic C 475 kN, static C0 655 kN, fatigue limit Pu 71 kN, limiting speed 1,300 r/min, no reference speed listed, mass about 4450 g." }, { "q": "What does C 3120 V mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 100 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "23120", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×165×52 mm envelope as the SKF spherical roller bearing SKF 23120 CC/W33, but catalogue C/C0 differ (475/655 kN vs 385/490 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23120-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×165×52 mm envelope as the SKF spherical roller bearing SKF 23120 CCK/W33, but catalogue C/C0 differ (475/655 kN vs 385/490 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3120-V", "C 3120 V" ], "locale_variants": {} }, { "sku": "C4120-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 4120-2CS5V/GEM9", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 100, "D_mm": 165, "B_mm": 65, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 475, "static_load_kN": 655, "fatigue_load_limit_kN": 69.5, "limiting_speed_rpm": 90, "max_rpm": 90, "weight_g": 5200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4120-2CS5V/GEM9 is the dimension series 41 CARB toroidal roller bearings member of the CARB range: 100 mm bore, 165 mm OD, 65 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (41) identify the ISO dimension series and the last two (100 mm (slash-size)) encode the 100 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 100 mm seat. The 5200 g mass over the 100×165×65 mm envelope yields about 4.75 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 100 mm seat or heat it (max 120 °C) and seat it square; never press through the 65 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 100 mm bore, shaft expansion is already measurable: calculate the required float inside the 65 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4120-2CS5V/GEM9 must float; the two are designed to be used as a pair.", "Never use C 4120-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 475/655 kN ratings belong to this exact execution (C 4120-2CS5V/GEM9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 475/655 kN ratings and 5200 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4120-2CS5V/GEM9 have?", "a": "A C 4120-2CS5V/GEM9 measures 100 mm bore × 165 mm outside diameter × 65 mm width (3.937 × 6.496 × 2.559 in). From SKF catalogue PUB BU/P1 17000: dynamic C 475 kN, static C0 655 kN, fatigue limit Pu 69.5 kN, limiting speed 90 r/min, no reference speed listed, mass about 5200 g." }, { "q": "What does C 4120-2CS5V/GEM9 mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 100 mm bore; 2CS5V/GEM9 is the execution (cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4120-2CS5V/GEM9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C4120-V-VE240", "equiv_brand": "SKF", "level": "full", "note": "Same 100×165×65 mm ISO 15 envelope and equivalent catalogue C/C0; C 4120 V/VE240 is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24120", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (100×165×65 mm) SKF spherical roller bearing SKF 24120 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24120 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4120-2CS5V-GEM9", "C 4120-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C4120-V-VE240", "brand": "SKF", "manufacturer_designation": "C 4120 V/VE240", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 100, "D_mm": 165, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 475, "static_load_kN": 655, "fatigue_load_limit_kN": 71, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 5300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 4120 V/VE240 denotes a toroidal roller bearing whose 65 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 4120 V/VE240 the 41 dimension series fixes the 165 mm OD and 65 mm width around the 100 mm bore (the bore is written directly after the slash (no bore code)); the suffix V/VE240 then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 100 mm shaft deflects; no reference speed is listed and the limiting speed is 1,300 r/min. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 4120 V/VE240 deliberately carries none. Mounting: slide the bearing onto the 100 mm seat or heat it (max 120 °C) and seat it square; never press through the 65 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 100 mm bore, shaft expansion is already measurable: calculate the required float inside the 65 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4120 V/VE240 must float; the two are designed to be used as a pair.", "Never use C 4120 V/VE240 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 100 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 475/655 kN ratings and 5300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (475 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4120 V/VE240 is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 4120 V/VE240 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 100 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 65 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4120 V/VE240?", "a": "A C 4120 V/VE240 measures 100 mm bore × 165 mm outside diameter × 65 mm width (3.937 × 6.496 × 2.559 in). From SKF catalogue PUB BU/P1 17000: dynamic C 475 kN, static C0 655 kN, fatigue limit Pu 71 kN, limiting speed 1,300 r/min, no reference speed listed, mass about 5300 g." }, { "q": "Can a CARB bearing like C 4120 V/VE240 locate the shaft axially?", "a": "No — that is the defining feature. C 4120 V/VE240 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C4120-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "Same 100×165×65 mm ISO 15 envelope and equivalent catalogue C/C0; C 4120-2CS5V/GEM9 is the cylindrical-bore sealed full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24120", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (100×165×65 mm) SKF spherical roller bearing SKF 24120 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24120 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4120-V-VE240", "C 4120 V/VE240" ], "locale_variants": {} }, { "sku": "C2220", "brand": "SKF", "manufacturer_designation": "C 2220", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 415, "static_load_kN": 465, "fatigue_load_limit_kN": 49, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 4950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2220 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 100×180×46 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 2220 separates into C (CARB), 22 (dimension series), 20 (100 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 100×180×46 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 100 mm seat. Selection arithmetic: C 415 kN against C0 465 kN gives a C0/C ratio of 1.12, and the 49 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 100 mm seat or heat it (max 120 °C) and seat it square; never press through the 46 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 100 mm bore, shaft expansion is already measurable: calculate the required float inside the 46 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2220 must float; the two are designed to be used as a pair.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 100 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 3,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 415/465 kN ratings and 4950 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 2220?", "a": "A C 2220 measures 100 mm bore × 180 mm outside diameter × 46 mm width (3.937 × 7.087 × 1.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 415 kN, static C0 465 kN, fatigue limit Pu 49 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 4950 g." }, { "q": "Can a CARB bearing like C 2220 locate the shaft axially?", "a": "No — that is the defining feature. C 2220 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2220 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 20 = 100 mm bore (code 20 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (415 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2220 is the cylindrical bore for direct shaft fitting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C2220-K", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×46 mm ISO 15 envelope and equivalent catalogue C/C0; C 2220 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22220", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (100×180×46 mm) SKF spherical roller bearing SKF 22220 E with ratings within 10 % — not a drop-in substitute: SKF 22220 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22220-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (100×180×46 mm) SKF spherical roller bearing SKF 22220 EK with ratings within 10 % — not a drop-in substitute: SKF 22220 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2220", "C 2220" ], "locale_variants": {} }, { "sku": "C2220-K", "brand": "SKF", "manufacturer_designation": "C 2220 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 415, "static_load_kN": 465, "fatigue_load_limit_kN": 49, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 4950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2220 K denotes a toroidal roller bearing whose 46 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 2220 K separates into C (CARB), 22 (dimension series), 20 (100 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 100×180×46 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 100 mm shaft deflects; the 3,600 r/min reference and 4,800 r/min limiting speed are both catalogue values. Selection arithmetic: C 415 kN against C0 465 kN gives a C0/C ratio of 1.12, and the 49 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 46 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 100 mm bore, shaft expansion is already measurable: calculate the required float inside the 46 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2220 K must float; the two are designed to be used as a pair.", "Never use C 2220 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 100 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 415/465 kN ratings and 4950 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (415 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2220 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage." }, { "q": "How is C 2220 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2220 K?", "a": "A C 2220 K measures 100 mm bore × 180 mm outside diameter × 46 mm width (3.937 × 7.087 × 1.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 415 kN, static C0 465 kN, fatigue limit Pu 49 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 4950 g." }, { "q": "Can a CARB bearing like C 2220 K locate the shaft axially?", "a": "No — that is the defining feature. C 2220 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C2220", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×46 mm ISO 15 envelope and equivalent catalogue C/C0; C 2220 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22220", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (100×180×46 mm) SKF spherical roller bearing SKF 22220 E with ratings within 10 % — not a drop-in substitute: SKF 22220 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22220-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (100×180×46 mm) SKF spherical roller bearing SKF 22220 EK with ratings within 10 % — not a drop-in substitute: SKF 22220 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2220-K", "C 2220 K" ], "locale_variants": {} }, { "sku": "C2320", "brand": "SKF", "manufacturer_designation": "C 2320", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 800, "static_load_kN": 880, "fatigue_load_limit_kN": 90, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2320 belongs to the CARB family — compact aligning roller bearings: envelope 100×215×73 mm, radial rating 800/880 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (23) identify the ISO dimension series and the last two (20) encode the 100 mm bore; suffixes describe bore and execution. The cylindrical 100 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 100×215×73 mm are identical — only the mounting method changes. Speed planning separates the 2,600 r/min thermal reference from the 3,600 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 100 mm seat or heat it (max 120 °C) and seat it square; never press through the 73 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 100 mm bore, shaft expansion is already measurable: calculate the required float inside the 73 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 800/880 kN ratings belong to this exact execution (C 2320); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 100 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 800/880 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 2320 have?", "a": "A C 2320 measures 100 mm bore × 215 mm outside diameter × 73 mm width (3.937 × 8.465 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 800 kN, static C0 880 kN, fatigue limit Pu 90 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 12500 g." }, { "q": "What does C 2320 mean in SKF part numbering?", "a": "C marks CARB; 23 the dimension series; the size code gives 100 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2320 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2320 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C2320-K", "equiv_brand": "SKF", "level": "full", "note": "Same 100×215×73 mm ISO 15 envelope and equivalent catalogue C/C0; C 2320 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22320", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (100×215×73 mm) SKF spherical roller bearing SKF 22320 E with ratings within 10 % — not a drop-in substitute: SKF 22320 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22320-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (100×215×73 mm) SKF spherical roller bearing SKF 22320 EK with ratings within 10 % — not a drop-in substitute: SKF 22320 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2320", "C 2320" ], "locale_variants": {} }, { "sku": "C2320-K", "brand": "SKF", "manufacturer_designation": "C 2320 K", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 800, "static_load_kN": 880, "fatigue_load_limit_kN": 90, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2320 K: the toroidal rollers allow the 100 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 2320 K separates into C (CARB), 23 (dimension series), 20 (100 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 100×215×73 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 100×215 mm size with 800 kN dynamic and a 2,600 r/min reference speed. The 12500 g mass over the 100×215×73 mm envelope yields about 8.00 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 73 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 100 mm bore, shaft expansion is already measurable: calculate the required float inside the 73 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the 2,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 800/880 kN ratings belong to this exact execution (C 2320 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2320 K must float; the two are designed to be used as a pair.", "The 800/880 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2320 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2320 K?", "a": "A C 2320 K measures 100 mm bore × 215 mm outside diameter × 73 mm width (3.937 × 8.465 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 800 kN, static C0 880 kN, fatigue limit Pu 90 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 12500 g." }, { "q": "Can a CARB bearing like C 2320 K locate the shaft axially?", "a": "No — that is the defining feature. C 2320 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2320 K designation read?", "a": "C = CARB toroidal family; 23 = dimension series; 20 = 100 mm bore (code 20 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2320", "equiv_brand": "SKF", "level": "full", "note": "Same 100×215×73 mm ISO 15 envelope and equivalent catalogue C/C0; C 2320 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22320", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (100×215×73 mm) SKF spherical roller bearing SKF 22320 E with ratings within 10 % — not a drop-in substitute: SKF 22320 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22320-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (100×215×73 mm) SKF spherical roller bearing SKF 22320 EK with ratings within 10 % — not a drop-in substitute: SKF 22320 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2320-K", "C 2320 K" ], "locale_variants": {} }, { "sku": "C4022-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 4022-2CS5V/GEM9", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 110, "D_mm": 170, "B_mm": 60, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 415, "static_load_kN": 585, "fatigue_load_limit_kN": 63, "limiting_speed_rpm": 85, "max_rpm": 85, "weight_g": 4600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 4022-2CS5V/GEM9: the toroidal rollers allow the 110 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 4022-2CS5V/GEM9 the 40 dimension series fixes the 170 mm OD and 60 mm width around the 110 mm bore (the bore is written directly after the slash (no bore code)); the suffix 2CS5V/GEM9 then selects the cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. The 2CS5V/GEM9 execution adds nitrile contact seals on both sides plus an annular-groove relubrication feature and a high-viscosity grease fill; the full-complement rollers keep 415 kN dynamic at a reduced 85 r/min ceiling. The 4600 g mass over the 110×170×60 mm envelope yields about 3.77 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 110 mm bore, shaft expansion is already measurable: calculate the required float inside the 60 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 415/585 kN ratings belong to this exact execution (C 4022-2CS5V/GEM9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 4022-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 110 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 415/585 kN ratings and 4600 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 4022-2CS5V/GEM9 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 110 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 60 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4022-2CS5V/GEM9?", "a": "A C 4022-2CS5V/GEM9 measures 110 mm bore × 170 mm outside diameter × 60 mm width (4.331 × 6.693 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 415 kN, static C0 585 kN, fatigue limit Pu 63 kN, limiting speed 85 r/min, no reference speed listed, mass about 4600 g." }, { "q": "Can a CARB bearing like C 4022-2CS5V/GEM9 locate the shaft axially?", "a": "No — that is the defining feature. C 4022-2CS5V/GEM9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4022-2CS5V/GEM9 designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 110 mm (slash-size) = 110 mm bore (the bore is written directly after the slash (no bore code)); suffix 2CS5V/GEM9 selects cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C4022-MB", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×170×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore MB inner-ring-guided brass-caged executions (415/585 kN vs 430/655 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4022-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×170×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore full-complement V executions (415/585 kN vs 500/800 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24022", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (110×170×60 mm) SKF spherical roller bearing SKF 24022 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24022 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4022-2CS5V-GEM9", "C 4022-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C4022-MB", "brand": "SKF", "manufacturer_designation": "C 4022 MB", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 110, "D_mm": 170, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 430, "static_load_kN": 655, "fatigue_load_limit_kN": 69.5, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 5300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 4022 MB denotes a toroidal roller bearing whose 60 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 4022 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 110 mm shaft deflects; the 2,600 r/min reference and 3,400 r/min limiting speed are both catalogue values. Selection arithmetic: C 430 kN against C0 655 kN gives a C0/C ratio of 1.52, and the 69.5 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 60 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 110 mm bore, shaft expansion is already measurable: calculate the required float inside the 60 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4022 MB must float; the two are designed to be used as a pair.", "Never use C 4022 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 110 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 430/655 kN ratings and 5300 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 4022 MB have?", "a": "A C 4022 MB measures 110 mm bore × 170 mm outside diameter × 60 mm width (4.331 × 6.693 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 430 kN, static C0 655 kN, fatigue limit Pu 69.5 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 5300 g." }, { "q": "What does C 4022 MB mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 110 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4022 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4022 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C4022-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×170×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore MB inner-ring-guided brass-caged and cylindrical-bore sealed full-complement V executions (430/655 kN vs 415/585 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4022-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×170×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore MB inner-ring-guided brass-caged and cylindrical-bore full-complement V executions (430/655 kN vs 500/800 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24022", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (110×170×60 mm) SKF spherical roller bearing SKF 24022 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24022 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4022-MB", "C 4022 MB" ], "locale_variants": {} }, { "sku": "C4022-V", "brand": "SKF", "manufacturer_designation": "C 4022 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 110, "D_mm": 170, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 500, "static_load_kN": 800, "fatigue_load_limit_kN": 85, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 5200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4022 V is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 110×170×60 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 4022 V the 40 dimension series fixes the 170 mm OD and 60 mm width around the 110 mm bore (code 22 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 110 mm shaft deflects; no reference speed is listed and the limiting speed is 1,200 r/min. The 5200 g mass over the 110×170×60 mm envelope yields about 4.55 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 170 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 110 mm bore, shaft expansion is already measurable: calculate the required float inside the 60 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4022 V must float; the two are designed to be used as a pair.", "The quoted 500/800 kN ratings belong to this exact execution (C 4022 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 4022 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 500/800 kN ratings and 5200 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 4022 V?", "a": "A C 4022 V measures 110 mm bore × 170 mm outside diameter × 60 mm width (4.331 × 6.693 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 500 kN, static C0 800 kN, fatigue limit Pu 85 kN, limiting speed 1,200 r/min, no reference speed listed, mass about 5200 g." }, { "q": "Can a CARB bearing like C 4022 V locate the shaft axially?", "a": "No — that is the defining feature. C 4022 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4022 V designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 22 = 110 mm bore (code 22 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (500 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4022 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." } ], "cross_ref": [ { "equiv_sku": "C4022-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×170×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore sealed full-complement V executions (500/800 kN vs 415/585 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4022-MB", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×170×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore MB inner-ring-guided brass-caged executions (500/800 kN vs 430/655 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24022", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×170×60 mm envelope as the SKF spherical roller bearing SKF 24022 CC/W33, but catalogue C/C0 differ (500/800 kN vs 437/620 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4022-V", "C 4022 V" ], "locale_variants": {} }, { "sku": "C4122-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 4122-2CS5V/GEM9", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 110, "D_mm": 180, "B_mm": 69, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 500, "static_load_kN": 710, "fatigue_load_limit_kN": 75, "limiting_speed_rpm": 80, "max_rpm": 80, "weight_g": 6600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4122-2CS5V/GEM9 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 110×180×69 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 4122-2CS5V/GEM9 the 41 dimension series fixes the 180 mm OD and 69 mm width around the 110 mm bore (the bore is written directly after the slash (no bore code)); the suffix 2CS5V/GEM9 then selects the cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. Both-side contact seals protect the full-complement roller set in contaminated housings, with grease for life at fitting. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 110 mm shaft deflects; no reference speed is listed and the limiting speed is 80 r/min. The 6600 g mass over the 110×180×69 mm envelope yields about 4.55 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 180 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 110 mm bore, shaft expansion is already measurable: calculate the required float inside the 69 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 500/710 kN ratings belong to this exact execution (C 4122-2CS5V/GEM9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 4122-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 500/710 kN ratings and 6600 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 4122-2CS5V/GEM9 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 110 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 69 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4122-2CS5V/GEM9?", "a": "A C 4122-2CS5V/GEM9 measures 110 mm bore × 180 mm outside diameter × 69 mm width (4.331 × 7.087 × 2.717 in). From SKF catalogue PUB BU/P1 17000: dynamic C 500 kN, static C0 710 kN, fatigue limit Pu 75 kN, limiting speed 80 r/min, no reference speed listed, mass about 6600 g." }, { "q": "Can a CARB bearing like C 4122-2CS5V/GEM9 locate the shaft axially?", "a": "No — that is the defining feature. C 4122-2CS5V/GEM9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4122-2CS5V/GEM9 designation read?", "a": "C = CARB toroidal family; 41 = dimension series; 110 mm (slash-size) = 110 mm bore (the bore is written directly after the slash (no bore code)); suffix 2CS5V/GEM9 selects cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C4122-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×180×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore full-complement V executions (500/710 kN vs 670/1000 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24122", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (110×180×69 mm) SKF spherical roller bearing SKF 24122 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24122 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24122-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (110×180×69 mm) SKF spherical roller bearing SKF 24122 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24122 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4122-2CS5V-GEM9", "C 4122-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C4122-V", "brand": "SKF", "manufacturer_designation": "C 4122 V", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 110, "D_mm": 180, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 670, "static_load_kN": 1000, "fatigue_load_limit_kN": 104, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 7100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 4122 V combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 110 mm bore, 180 mm outside diameter, 69 mm wide unit rated 670 kN dynamic. In C 4122 V the 41 dimension series fixes the 180 mm OD and 69 mm width around the 110 mm bore (code 22 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The V suffix denotes a full complement: the toroidal rollers fill the 69 mm space without a cage, raising C to 670 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 4122 V deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 110 mm bore, shaft expansion is already measurable: calculate the required float inside the 69 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 670/1000 kN ratings belong to this exact execution (C 4122 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 4122 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 110 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 670/1000 kN ratings and 7100 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 4122 V locate the shaft axially?", "a": "No — that is the defining feature. C 4122 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4122 V designation read?", "a": "C = CARB toroidal family; 41 = dimension series; 22 = 110 mm bore (code 22 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (670 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4122 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 4122 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 110 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 69 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C4122-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×180×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore sealed full-complement V executions (670/1000 kN vs 500/710 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24122", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×180×69 mm envelope as the SKF spherical roller bearing SKF 24122 CC/W33, but catalogue C/C0 differ (670/1000 kN vs 539/750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24122-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×180×69 mm envelope as the SKF spherical roller bearing SKF 24122 CCK30/W33, but catalogue C/C0 differ (670/1000 kN vs 539/750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4122-V", "C 4122 V" ], "locale_variants": {} }, { "sku": "C2222", "brand": "SKF", "manufacturer_designation": "C 2222", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 530, "static_load_kN": 620, "fatigue_load_limit_kN": 64, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2222 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 110 mm bore, 200 mm outside diameter, 53 mm wide unit rated 530 kN dynamic. In C 2222 the 22 dimension series fixes the 200 mm OD and 53 mm width around the 110 mm bore (code 22 × 5); the suffix the bare number then selects the cylindrical bore for direct shaft fitting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 110 mm seat. Selection arithmetic: C 530 kN against C0 620 kN gives a C0/C ratio of 1.17, and the 64 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 200 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 110 mm bore, shaft expansion is already measurable: calculate the required float inside the 53 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the 3,200 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 530/620 kN ratings belong to this exact execution (C 2222); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 2222 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 530/620 kN ratings and 7000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (530 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2222 is the cylindrical bore for direct shaft fitting, pressed steel cage." }, { "q": "How is C 2222 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 110 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 53 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2222?", "a": "A C 2222 measures 110 mm bore × 200 mm outside diameter × 53 mm width (4.331 × 7.874 × 2.087 in). From SKF catalogue PUB BU/P1 17000: dynamic C 530 kN, static C0 620 kN, fatigue limit Pu 64 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 7000 g." }, { "q": "Can a CARB bearing like C 2222 locate the shaft axially?", "a": "No — that is the defining feature. C 2222 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C2222-K", "equiv_brand": "SKF", "level": "full", "note": "Same 110×200×53 mm ISO 15 envelope and equivalent catalogue C/C0; C 2222 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22222", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (110×200×53 mm) SKF spherical roller bearing SKF 22222 E with ratings within 10 % — not a drop-in substitute: SKF 22222 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22222-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (110×200×53 mm) SKF spherical roller bearing SKF 22222 EK with ratings within 10 % — not a drop-in substitute: SKF 22222 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2222", "C 2222" ], "locale_variants": {} }, { "sku": "C2222-K", "brand": "SKF", "manufacturer_designation": "C 2222 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 530, "static_load_kN": 620, "fatigue_load_limit_kN": 64, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2222 K belongs to the CARB family — compact aligning roller bearings: envelope 110×200×53 mm, radial rating 530/620 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 2222 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The K suffix gives a 1:12 tapered 110 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 110×200×53 mm are identical — only the mounting method changes. Speed planning separates the 3,200 r/min thermal reference from the 4,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 53 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 110 mm bore, shaft expansion is already measurable: calculate the required float inside the 53 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 110 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 3,200 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2222 K must float; the two are designed to be used as a pair.", "Never use C 2222 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 530/620 kN ratings and 7000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 2222 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2222 K have?", "a": "A C 2222 K measures 110 mm bore × 200 mm outside diameter × 53 mm width (4.331 × 7.874 × 2.087 in). From SKF catalogue PUB BU/P1 17000: dynamic C 530 kN, static C0 620 kN, fatigue limit Pu 64 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 7000 g." }, { "q": "What does C 2222 K mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 110 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C2222", "equiv_brand": "SKF", "level": "full", "note": "Same 110×200×53 mm ISO 15 envelope and equivalent catalogue C/C0; C 2222 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22222", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (110×200×53 mm) SKF spherical roller bearing SKF 22222 E with ratings within 10 % — not a drop-in substitute: SKF 22222 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22222-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (110×200×53 mm) SKF spherical roller bearing SKF 22222 EK with ratings within 10 % — not a drop-in substitute: SKF 22222 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2222-K", "C 2222 K" ], "locale_variants": {} }, { "sku": "C3024-V", "brand": "SKF", "manufacturer_designation": "C 3024 V", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 120, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 430, "static_load_kN": 640, "fatigue_load_limit_kN": 65.5, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 4100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3024 V belongs to the CARB family — compact aligning roller bearings: envelope 120×180×46 mm, radial rating 430/640 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (24) encode the 120 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 120 mm shaft deflects; no reference speed is listed and the limiting speed is 1,400 r/min. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 1,400 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 46 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 120 mm bore, shaft expansion is already measurable: calculate the required float inside the 46 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3024 V must float; the two are designed to be used as a pair.", "Never use C 3024 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 430/640 kN ratings belong to this exact execution (C 3024 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 430/640 kN ratings and 4100 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 3024 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3024 V have?", "a": "A C 3024 V measures 120 mm bore × 180 mm outside diameter × 46 mm width (4.724 × 7.087 × 1.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 430 kN, static C0 640 kN, fatigue limit Pu 65.5 kN, limiting speed 1,400 r/min, no reference speed listed, mass about 4100 g." }, { "q": "What does C 3024 V mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 120 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "23024", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×46 mm envelope as the SKF spherical roller bearing SKF 23024 CC/W33, but catalogue C/C0 differ (430/640 kN vs 366/500 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23024-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×46 mm envelope as the SKF spherical roller bearing SKF 23024 CCK/W33, but catalogue C/C0 differ (430/640 kN vs 366/500 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3024-V", "C 3024 V" ], "locale_variants": {} }, { "sku": "C4024-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 4024-2CS5V/GEM9", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 120, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 430, "static_load_kN": 640, "fatigue_load_limit_kN": 67, "limiting_speed_rpm": 80, "max_rpm": 80, "weight_g": 5100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4024-2CS5V/GEM9 is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 120 mm bore, 180 mm OD, 60 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 4024-2CS5V/GEM9 the 40 dimension series fixes the 180 mm OD and 60 mm width around the 120 mm bore (the bore is written directly after the slash (no bore code)); the suffix 2CS5V/GEM9 then selects the cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. The cylindrical 120 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 120×180×60 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 60 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Sealed executions arrive greased for life: do not wash out the factory fill, and mount seals-clear of the housing shoulder edges. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 60 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 120 mm bore, shaft expansion is already measurable: calculate the required float inside the 60 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 4024-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 120 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 430/640 kN ratings belong to this exact execution (C 4024-2CS5V/GEM9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 430/640 kN ratings and 5100 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 4024-2CS5V/GEM9 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 120 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 60 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4024-2CS5V/GEM9?", "a": "A C 4024-2CS5V/GEM9 measures 120 mm bore × 180 mm outside diameter × 60 mm width (4.724 × 7.087 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 430 kN, static C0 640 kN, fatigue limit Pu 67 kN, limiting speed 80 r/min, no reference speed listed, mass about 5100 g." }, { "q": "Can a CARB bearing like C 4024-2CS5V/GEM9 locate the shaft axially?", "a": "No — that is the defining feature. C 4024-2CS5V/GEM9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4024-2CS5V/GEM9 designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 120 mm (slash-size) = 120 mm bore (the bore is written directly after the slash (no bore code)); suffix 2CS5V/GEM9 selects cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C4024-V-VE240", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×60 mm ISO 15 envelope and equivalent catalogue C/C0; C 4024 V/VE240 is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C4024-K30V-VE240", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×60 mm ISO 15 envelope and equivalent catalogue C/C0; C 4024 K30V/VE240 is the 1:30 tapered-bore K30 full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C4024-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore full-complement V executions (430/640 kN vs 530/880 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4024-K30V", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and 1:30 tapered-bore K30 full-complement V executions (430/640 kN vs 530/880 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24024", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (120×180×60 mm) SKF spherical roller bearing SKF 24024 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24024 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24024-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (120×180×60 mm) SKF spherical roller bearing SKF 24024 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24024 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4024-2CS5V-GEM9", "C 4024-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C4024-V-VE240", "brand": "SKF", "manufacturer_designation": "C 4024 V/VE240", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 120, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 430, "static_load_kN": 640, "fatigue_load_limit_kN": 65.5, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 5050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 4024 V/VE240: the toroidal rollers allow the 120 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (120 mm (slash-size)) encode the 120 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 120 mm shaft deflects; no reference speed is listed and the limiting speed is 1,400 r/min. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 60 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 60 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 120 mm bore, shaft expansion is already measurable: calculate the required float inside the 60 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 430/640 kN ratings belong to this exact execution (C 4024 V/VE240); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 4024 V/VE240 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 430/640 kN ratings and 5050 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 4024 V/VE240 sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4024 V/VE240 have?", "a": "A C 4024 V/VE240 measures 120 mm bore × 180 mm outside diameter × 60 mm width (4.724 × 7.087 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 430 kN, static C0 640 kN, fatigue limit Pu 65.5 kN, limiting speed 1,400 r/min, no reference speed listed, mass about 5050 g." }, { "q": "What does C 4024 V/VE240 mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 120 mm bore; V/VE240 is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C4024-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×60 mm ISO 15 envelope and equivalent catalogue C/C0; C 4024-2CS5V/GEM9 is the cylindrical-bore sealed full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C4024-K30V-VE240", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×60 mm ISO 15 envelope and equivalent catalogue C/C0; C 4024 K30V/VE240 is the 1:30 tapered-bore K30 full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C4024-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore full-complement V executions (430/640 kN vs 530/880 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4024-K30V", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:30 tapered-bore K30 full-complement V executions (430/640 kN vs 530/880 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24024", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (120×180×60 mm) SKF spherical roller bearing SKF 24024 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24024 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24024-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (120×180×60 mm) SKF spherical roller bearing SKF 24024 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24024 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4024-V-VE240", "C 4024 V/VE240" ], "locale_variants": {} }, { "sku": "C4024-K30V-VE240", "brand": "SKF", "manufacturer_designation": "C 4024 K30V/VE240", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 120, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 430, "static_load_kN": 640, "fatigue_load_limit_kN": 65.5, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 5050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4024 K30V/VE240 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 120×180×60 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 4024 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30V/VE240. The K30 suffix gives a 1:30 tapered 120 mm bore, mounted on a withdrawal (AH) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 120×180×60 mm are identical — only the mounting method changes. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 1,400 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: mount on the withdrawal (AH) sleeve matched to the 1:30 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 60 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 120 mm bore, shaft expansion is already measurable: calculate the required float inside the 60 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 430/640 kN ratings belong to this exact execution (C 4024 K30V/VE240); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 120 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 430/640 kN ratings and 5050 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 4024 K30V/VE240 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4024 K30V/VE240 sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4024 K30V/VE240 have?", "a": "A C 4024 K30V/VE240 measures 120 mm bore × 180 mm outside diameter × 60 mm width (4.724 × 7.087 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 430 kN, static C0 640 kN, fatigue limit Pu 65.5 kN, limiting speed 1,400 r/min, no reference speed listed, mass about 5050 g." } ], "cross_ref": [ { "equiv_sku": "C4024-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×60 mm ISO 15 envelope and equivalent catalogue C/C0; C 4024-2CS5V/GEM9 is the cylindrical-bore sealed full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C4024-V-VE240", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×60 mm ISO 15 envelope and equivalent catalogue C/C0; C 4024 V/VE240 is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C4024-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore full-complement V executions (430/640 kN vs 530/880 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4024-K30V", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and 1:30 tapered-bore K30 full-complement V executions (430/640 kN vs 530/880 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24024", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (120×180×60 mm) SKF spherical roller bearing SKF 24024 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24024 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24024-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (120×180×60 mm) SKF spherical roller bearing SKF 24024 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24024 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4024-K30V-VE240", "C 4024 K30V/VE240" ], "locale_variants": {} }, { "sku": "C4024-V", "brand": "SKF", "manufacturer_designation": "C 4024 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 120, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 530, "static_load_kN": 880, "fatigue_load_limit_kN": 91.5, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 5550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 4024 V in the dimension series 40 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (24) encode the 120 mm bore; suffixes describe bore and execution. The cylindrical 120 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 120×180×60 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 60 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 180 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 120 mm bore, shaft expansion is already measurable: calculate the required float inside the 60 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 120 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 530/880 kN ratings belong to this exact execution (C 4024 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 530/880 kN ratings and 5550 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 4024 V have?", "a": "A C 4024 V measures 120 mm bore × 180 mm outside diameter × 60 mm width (4.724 × 7.087 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 530 kN, static C0 880 kN, fatigue limit Pu 91.5 kN, limiting speed 1,100 r/min, no reference speed listed, mass about 5550 g." }, { "q": "What does C 4024 V mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 120 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4024 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4024 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C4024-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore sealed full-complement V executions (530/880 kN vs 430/640 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4024-V-VE240", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore full-complement V executions (530/880 kN vs 430/640 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4024-K30V-VE240", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:30 tapered-bore K30 full-complement V executions (530/880 kN vs 430/640 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4024-K30V", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×60 mm ISO 15 envelope and equivalent catalogue C/C0; C 4024 K30V is the 1:30 tapered-bore K30 full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24024", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope as the SKF spherical roller bearing SKF 24024 CC/W33, but catalogue C/C0 differ (530/880 kN vs 456/670 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24024-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope as the SKF spherical roller bearing SKF 24024 CCK30/W33, but catalogue C/C0 differ (530/880 kN vs 456/670 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4024-V", "C 4024 V" ], "locale_variants": {} }, { "sku": "C4024-K30V", "brand": "SKF", "manufacturer_designation": "C 4024 K30V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 120, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 530, "static_load_kN": 880, "fatigue_load_limit_kN": 91.5, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 5550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 4024 K30V in the dimension series 40 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 4024 K30V the 40 dimension series fixes the 180 mm OD and 60 mm width around the 120 mm bore (code 24 × 5); the suffix K30V then selects the tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage). The K30 suffix gives a 1:30 tapered 120 mm bore, mounted on a withdrawal (AH) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 120×180×60 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 4024 K30V deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 120 mm bore, shaft expansion is already measurable: calculate the required float inside the 60 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4024 K30V must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 530/880 kN ratings belong to this exact execution (C 4024 K30V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 530/880 kN ratings and 5550 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 4024 K30V?", "a": "A C 4024 K30V measures 120 mm bore × 180 mm outside diameter × 60 mm width (4.724 × 7.087 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 530 kN, static C0 880 kN, fatigue limit Pu 91.5 kN, limiting speed 1,100 r/min, no reference speed listed, mass about 5550 g." }, { "q": "Can a CARB bearing like C 4024 K30V locate the shaft axially?", "a": "No — that is the defining feature. C 4024 K30V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4024 K30V designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 24 = 120 mm bore (code 24 × 5); suffix K30V selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (530 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4024 K30V is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)." } ], "cross_ref": [ { "equiv_sku": "C4024-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore sealed full-complement V executions (530/880 kN vs 430/640 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4024-V-VE240", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore full-complement V executions (530/880 kN vs 430/640 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4024-K30V-VE240", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and 1:30 tapered-bore K30 full-complement V executions (530/880 kN vs 430/640 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4024-V", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×60 mm ISO 15 envelope and equivalent catalogue C/C0; C 4024 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24024", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope as the SKF spherical roller bearing SKF 24024 CC/W33, but catalogue C/C0 differ (530/880 kN vs 456/670 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24024-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×60 mm envelope as the SKF spherical roller bearing SKF 24024 CCK30/W33, but catalogue C/C0 differ (530/880 kN vs 456/670 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4024-K30V", "C 4024 K30V" ], "locale_variants": {} }, { "sku": "C4124-V", "brand": "SKF", "manufacturer_designation": "C 4124 V", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 120, "D_mm": 200, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 780, "static_load_kN": 1120, "fatigue_load_limit_kN": 114, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 4124 V denotes a toroidal roller bearing whose 80 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 4124 V separates into C (CARB), 41 (dimension series), 24 (120 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 120×200×80 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 120 mm seat. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 750 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 120 mm bore, shaft expansion is already measurable: calculate the required float inside the 80 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 4124 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 120 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 780/1120 kN ratings belong to this exact execution (C 4124 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 780/1120 kN ratings and 10000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 4124 V locate the shaft axially?", "a": "No — that is the defining feature. C 4124 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4124 V designation read?", "a": "C = CARB toroidal family; 41 = dimension series; 24 = 120 mm bore (code 24 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (780 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4124 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 4124 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 120 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 80 mm roller set." } ], "cross_ref": [ { "equiv_sku": "24124", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×200×80 mm envelope as the SKF spherical roller bearing SKF 24124 CC/W33, but catalogue C/C0 differ (780/1120 kN vs 679/950 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24124-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×200×80 mm envelope as the SKF spherical roller bearing SKF 24124 CCK30/W33, but catalogue C/C0 differ (780/1120 kN vs 679/950 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4124-V", "C 4124 V" ], "locale_variants": {} }, { "sku": "C3224", "brand": "SKF", "manufacturer_designation": "C 3224", "series": "C3200-series", "type": "carb_toroidal", "d_mm": 120, "D_mm": 215, "B_mm": 76, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 750, "static_load_kN": 980, "fatigue_load_limit_kN": 98, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 12000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3224 belongs to the CARB family — compact aligning roller bearings: envelope 120×215×76 mm, radial rating 750/980 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (32) identify the ISO dimension series and the last two (24) encode the 120 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 120 mm shaft deflects; the 2,400 r/min reference and 3,200 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3224 deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 215 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 120 mm bore, shaft expansion is already measurable: calculate the required float inside the 76 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 120 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 750/980 kN ratings belong to this exact execution (C 3224); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 750/980 kN ratings and 12000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3224 mean in SKF part numbering?", "a": "C marks CARB; 32 the dimension series; the size code gives 120 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3224 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3224 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C3224-K", "equiv_brand": "SKF", "level": "full", "note": "Same 120×215×76 mm ISO 15 envelope and equivalent catalogue C/C0; C 3224 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23224", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (120×215×76 mm) SKF spherical roller bearing SKF 23224 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23224 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23224-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (120×215×76 mm) SKF spherical roller bearing SKF 23224 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23224 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3224", "C 3224" ], "locale_variants": {} }, { "sku": "C3224-K", "brand": "SKF", "manufacturer_designation": "C 3224 K", "series": "C3200-series", "type": "carb_toroidal", "d_mm": 120, "D_mm": 215, "B_mm": 76, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 750, "static_load_kN": 980, "fatigue_load_limit_kN": 98, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 12000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3224 K belongs to the CARB family — compact aligning roller bearings: envelope 120×215×76 mm, radial rating 750/980 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (32) identify the ISO dimension series and the last two (24) encode the 120 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 120 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 120×215×76 mm are identical — only the mounting method changes. Speed planning separates the 2,400 r/min thermal reference from the 3,200 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 215 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 120 mm bore, shaft expansion is already measurable: calculate the required float inside the 76 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 120 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 3224 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 750/980 kN ratings belong to this exact execution (C 3224 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 750/980 kN ratings and 12000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3224 K mean in SKF part numbering?", "a": "C marks CARB; 32 the dimension series; the size code gives 120 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3224 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3224 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C3224", "equiv_brand": "SKF", "level": "full", "note": "Same 120×215×76 mm ISO 15 envelope and equivalent catalogue C/C0; C 3224 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23224", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (120×215×76 mm) SKF spherical roller bearing SKF 23224 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23224 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23224-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (120×215×76 mm) SKF spherical roller bearing SKF 23224 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23224 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3224-K", "C 3224 K" ], "locale_variants": {} }, { "sku": "C4026-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 4026-2CS5V/GEM9", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 130, "D_mm": 200, "B_mm": 69, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 550, "static_load_kN": 830, "fatigue_load_limit_kN": 85, "limiting_speed_rpm": 70, "max_rpm": 70, "weight_g": 7500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4026-2CS5V/GEM9 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 130×200×69 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 4026-2CS5V/GEM9 the 40 dimension series fixes the 200 mm OD and 69 mm width around the 130 mm bore (the bore is written directly after the slash (no bore code)); the suffix 2CS5V/GEM9 then selects the cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove. The cylindrical 130 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 130×200×69 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 69 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 130 mm seat or heat it (max 120 °C) and seat it square; never press through the 69 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 130 mm bore, shaft expansion is already measurable: calculate the required float inside the 69 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4026-2CS5V/GEM9 must float; the two are designed to be used as a pair.", "Never use C 4026-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 130 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 550/830 kN ratings and 7500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (550 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4026-2CS5V/GEM9 is the cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove." }, { "q": "How is C 4026-2CS5V/GEM9 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 130 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 69 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4026-2CS5V/GEM9?", "a": "A C 4026-2CS5V/GEM9 measures 130 mm bore × 200 mm outside diameter × 69 mm width (5.118 × 7.874 × 2.717 in). From SKF catalogue PUB BU/P1 17000: dynamic C 550 kN, static C0 830 kN, fatigue limit Pu 85 kN, limiting speed 70 r/min, no reference speed listed, mass about 7500 g." }, { "q": "Can a CARB bearing like C 4026-2CS5V/GEM9 locate the shaft axially?", "a": "No — that is the defining feature. C 4026-2CS5V/GEM9 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C4026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore steel-caged executions (550/830 kN vs 620/930 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026-K30", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and 1:30 tapered-bore K30 steel-caged executions (550/830 kN vs 620/930 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore full-complement V executions (550/830 kN vs 720/1120 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026-K30V", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and 1:30 tapered-bore K30 full-complement V executions (550/830 kN vs 720/1120 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24026", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (130×200×69 mm) SKF spherical roller bearing SKF 24026 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24026 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24026-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (130×200×69 mm) SKF spherical roller bearing SKF 24026 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24026 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4026-2CS5V-GEM9", "C 4026-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C4026", "brand": "SKF", "manufacturer_designation": "C 4026", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 130, "D_mm": 200, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 620, "static_load_kN": 930, "fatigue_load_limit_kN": 93, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 7850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 4026 denotes a toroidal roller bearing whose 69 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (26) encode the 130 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 130 mm seat. Speed planning separates the 2,200 r/min thermal reference from the 2,800 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 69 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 130 mm bore, shaft expansion is already measurable: calculate the required float inside the 69 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 620/930 kN ratings belong to this exact execution (C 4026); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Reference and limiting speeds are different limits: the 2,200 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 4026 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 620/930 kN ratings and 7850 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 4026 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4026 have?", "a": "A C 4026 measures 130 mm bore × 200 mm outside diameter × 69 mm width (5.118 × 7.874 × 2.717 in). From SKF catalogue PUB BU/P1 17000: dynamic C 620 kN, static C0 930 kN, fatigue limit Pu 93 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 7850 g." }, { "q": "What does C 4026 mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 130 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C4026-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore steel-caged and cylindrical-bore sealed full-complement V executions (620/930 kN vs 550/830 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026-K30", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×69 mm ISO 15 envelope and equivalent catalogue C/C0; C 4026 K30 is the 1:30 tapered-bore K30 steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C4026-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore steel-caged and cylindrical-bore full-complement V executions (620/930 kN vs 720/1120 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026-K30V", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore steel-caged and 1:30 tapered-bore K30 full-complement V executions (620/930 kN vs 720/1120 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope as the SKF spherical roller bearing SKF 24026 CC/W33, but catalogue C/C0 differ (620/930 kN vs 569/815 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24026-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope as the SKF spherical roller bearing SKF 24026 CCK30/W33, but catalogue C/C0 differ (620/930 kN vs 569/815 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4026", "C 4026" ], "locale_variants": {} }, { "sku": "C4026-K30", "brand": "SKF", "manufacturer_designation": "C 4026 K30", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 130, "D_mm": 200, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 620, "static_load_kN": 930, "fatigue_load_limit_kN": 93, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 7850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 4026 K30 denotes a toroidal roller bearing whose 69 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (26) encode the 130 mm bore; suffixes describe bore and execution. The K30 suffix gives a 1:30 tapered 130 mm bore, mounted on a withdrawal (AH) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 130×200×69 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 69 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 69 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 130 mm bore, shaft expansion is already measurable: calculate the required float inside the 69 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 620/930 kN ratings belong to this exact execution (C 4026 K30); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4026 K30 must float; the two are designed to be used as a pair.", "Never use C 4026 K30 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 620/930 kN ratings and 7850 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4026 K30 have?", "a": "A C 4026 K30 measures 130 mm bore × 200 mm outside diameter × 69 mm width (5.118 × 7.874 × 2.717 in). From SKF catalogue PUB BU/P1 17000: dynamic C 620 kN, static C0 930 kN, fatigue limit Pu 93 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 7850 g." }, { "q": "What does C 4026 K30 mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 130 mm bore; K30 is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4026 K30 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C4026-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 steel-caged and cylindrical-bore sealed full-complement V executions (620/930 kN vs 550/830 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×69 mm ISO 15 envelope and equivalent catalogue C/C0; C 4026 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C4026-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 steel-caged and cylindrical-bore full-complement V executions (620/930 kN vs 720/1120 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026-K30V", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 steel-caged and 1:30 tapered-bore K30 full-complement V executions (620/930 kN vs 720/1120 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope as the SKF spherical roller bearing SKF 24026 CC/W33, but catalogue C/C0 differ (620/930 kN vs 569/815 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24026-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope as the SKF spherical roller bearing SKF 24026 CCK30/W33, but catalogue C/C0 differ (620/930 kN vs 569/815 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4026-K30", "C 4026 K30" ], "locale_variants": {} }, { "sku": "C4026-V", "brand": "SKF", "manufacturer_designation": "C 4026 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 130, "D_mm": 200, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 720, "static_load_kN": 1120, "fatigue_load_limit_kN": 112, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 8150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 4026 V combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 130 mm bore, 200 mm outside diameter, 69 mm wide unit rated 720 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 4026 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The V suffix denotes a full complement: the toroidal rollers fill the 69 mm space without a cage, raising C to 720 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 850 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 69 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 130 mm bore, shaft expansion is already measurable: calculate the required float inside the 69 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4026 V must float; the two are designed to be used as a pair.", "Never use C 4026 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 130 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 720/1120 kN ratings and 8150 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 4026 V mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 130 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4026 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4026 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C4026-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore sealed full-complement V executions (720/1120 kN vs 550/830 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore steel-caged executions (720/1120 kN vs 620/930 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026-K30", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:30 tapered-bore K30 steel-caged executions (720/1120 kN vs 620/930 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026-K30V", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×69 mm ISO 15 envelope and equivalent catalogue C/C0; C 4026 K30V is the 1:30 tapered-bore K30 full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope as the SKF spherical roller bearing SKF 24026 CC/W33, but catalogue C/C0 differ (720/1120 kN vs 569/815 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24026-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope as the SKF spherical roller bearing SKF 24026 CCK30/W33, but catalogue C/C0 differ (720/1120 kN vs 569/815 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4026-V", "C 4026 V" ], "locale_variants": {} }, { "sku": "C4026-K30V", "brand": "SKF", "manufacturer_designation": "C 4026 K30V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 130, "D_mm": 200, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 720, "static_load_kN": 1120, "fatigue_load_limit_kN": 112, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 8150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 4026 K30V combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 130 mm bore, 200 mm outside diameter, 69 mm wide unit rated 720 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (26) encode the 130 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 130 mm seat. Selection arithmetic: C 720 kN against C0 1120 kN gives a C0/C ratio of 1.56, and the 112 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the withdrawal (AH) sleeve matched to the 1:30 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 69 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 130 mm bore, shaft expansion is already measurable: calculate the required float inside the 69 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 720/1120 kN ratings belong to this exact execution (C 4026 K30V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4026 K30V must float; the two are designed to be used as a pair.", "Never use C 4026 K30V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 720/1120 kN ratings and 8150 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 4026 K30V have?", "a": "A C 4026 K30V measures 130 mm bore × 200 mm outside diameter × 69 mm width (5.118 × 7.874 × 2.717 in). From SKF catalogue PUB BU/P1 17000: dynamic C 720 kN, static C0 1120 kN, fatigue limit Pu 112 kN, limiting speed 850 r/min, no reference speed listed, mass about 8150 g." }, { "q": "What does C 4026 K30V mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 130 mm bore; K30V is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4026 K30V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4026 K30V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C4026-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore sealed full-complement V executions (720/1120 kN vs 550/830 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore steel-caged executions (720/1120 kN vs 620/930 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026-K30", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and 1:30 tapered-bore K30 steel-caged executions (720/1120 kN vs 620/930 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4026-V", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×69 mm ISO 15 envelope and equivalent catalogue C/C0; C 4026 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope as the SKF spherical roller bearing SKF 24026 CC/W33, but catalogue C/C0 differ (720/1120 kN vs 569/815 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24026-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×69 mm envelope as the SKF spherical roller bearing SKF 24026 CCK30/W33, but catalogue C/C0 differ (720/1120 kN vs 569/815 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4026-K30V", "C 4026 K30V" ], "locale_variants": {} }, { "sku": "C4126-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 4126-2CS5V/GEM9", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 130, "D_mm": 210, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 750, "static_load_kN": 1100, "fatigue_load_limit_kN": 108, "limiting_speed_rpm": 70, "max_rpm": 70, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4126-2CS5V/GEM9 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 130×210×80 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 4126 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here 2CS5V/GEM9. The cylindrical 130 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 130×210×80 mm are identical — only the mounting method changes. The 10500 g mass over the 130×210×80 mm envelope yields about 5.77 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Sealed executions arrive greased for life: do not wash out the factory fill, and mount seals-clear of the housing shoulder edges. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 80 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 130 mm bore, shaft expansion is already measurable: calculate the required float inside the 80 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 750/1100 kN ratings belong to this exact execution (C 4126-2CS5V/GEM9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 4126-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 750/1100 kN ratings and 10500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 4126-2CS5V/GEM9 sealed?", "a": "Yes — this is a sealed full-complement execution (2CS5V contact seals with annular groove), greased at the factory; the catalogue lists no reference speed and the limiting speed is 70 r/min." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4126-2CS5V/GEM9 have?", "a": "A C 4126-2CS5V/GEM9 measures 130 mm bore × 210 mm outside diameter × 80 mm width (5.118 × 8.268 × 3.15 in). From SKF catalogue PUB BU/P1 17000: dynamic C 750 kN, static C0 1100 kN, fatigue limit Pu 108 kN, limiting speed 70 r/min, no reference speed listed, mass about 10500 g." }, { "q": "What does C 4126-2CS5V/GEM9 mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 130 mm bore; 2CS5V/GEM9 is the execution (cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "24126", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (130×210×80 mm) SKF spherical roller bearing SKF 24126 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24126 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24126-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (130×210×80 mm) SKF spherical roller bearing SKF 24126 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24126 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4126-2CS5V-GEM9", "C 4126-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C2226", "brand": "SKF", "manufacturer_designation": "C 2226", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 930, "fatigue_load_limit_kN": 91.5, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2226 is the dimension series 22 CARB toroidal roller bearings member of the CARB range: 130 mm bore, 230 mm OD, 64 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 2226 the 22 dimension series fixes the 230 mm OD and 64 mm width around the 130 mm bore (code 26 × 5); the suffix the bare number then selects the cylindrical bore for direct shaft fitting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 130 mm seat. Selection arithmetic: C 735 kN against C0 930 kN gives a C0/C ratio of 1.27, and the 91.5 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 230 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 130 mm bore, shaft expansion is already measurable: calculate the required float inside the 64 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2226 must float; the two are designed to be used as a pair.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 130 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 735/930 kN ratings and 11500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2226 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 130 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 64 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2226?", "a": "A C 2226 measures 130 mm bore × 230 mm outside diameter × 64 mm width (5.118 × 9.055 × 2.52 in). From SKF catalogue PUB BU/P1 17000: dynamic C 735 kN, static C0 930 kN, fatigue limit Pu 91.5 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 11500 g." }, { "q": "Can a CARB bearing like C 2226 locate the shaft axially?", "a": "No — that is the defining feature. C 2226 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2226 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 26 = 130 mm bore (code 26 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2226-K", "equiv_brand": "SKF", "level": "full", "note": "Same 130×230×64 mm ISO 15 envelope and equivalent catalogue C/C0; C 2226 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22226", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (130×230×64 mm) SKF spherical roller bearing SKF 22226 E with ratings within 10 % — not a drop-in substitute: SKF 22226 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22226-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (130×230×64 mm) SKF spherical roller bearing SKF 22226 EK with ratings within 10 % — not a drop-in substitute: SKF 22226 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2226", "C 2226" ], "locale_variants": {} }, { "sku": "C2226-K", "brand": "SKF", "manufacturer_designation": "C 2226 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 930, "fatigue_load_limit_kN": 91.5, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 2226 K in the dimension series 22 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. The designation C 2226 K separates into C (CARB), 22 (dimension series), 26 (130 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 130×230×64 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 130 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 130×230×64 mm are identical — only the mounting method changes. Selection arithmetic: C 735 kN against C0 930 kN gives a C0/C ratio of 1.27, and the 91.5 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 64 mm wide cavity does not fill itself.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 130 mm bore, shaft expansion is already measurable: calculate the required float inside the 64 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the 2,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 735/930 kN ratings belong to this exact execution (C 2226 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 2226 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 130 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 735/930 kN ratings and 11500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 2226 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2226 K?", "a": "A C 2226 K measures 130 mm bore × 230 mm outside diameter × 64 mm width (5.118 × 9.055 × 2.52 in). From SKF catalogue PUB BU/P1 17000: dynamic C 735 kN, static C0 930 kN, fatigue limit Pu 91.5 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 11500 g." }, { "q": "Can a CARB bearing like C 2226 K locate the shaft axially?", "a": "No — that is the defining feature. C 2226 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2226 K designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 26 = 130 mm bore (code 26 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C2226", "equiv_brand": "SKF", "level": "full", "note": "Same 130×230×64 mm ISO 15 envelope and equivalent catalogue C/C0; C 2226 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22226", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (130×230×64 mm) SKF spherical roller bearing SKF 22226 E with ratings within 10 % — not a drop-in substitute: SKF 22226 E locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "22226-EK", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (130×230×64 mm) SKF spherical roller bearing SKF 22226 EK with ratings within 10 % — not a drop-in substitute: SKF 22226 EK locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2226-K", "C 2226 K" ], "locale_variants": {} }, { "sku": "C2326-K-VE240", "brand": "SKF", "manufacturer_designation": "C 2326 K/VE240", "series": "C2300-series", "type": "carb_toroidal", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 980, "static_load_kN": 1220, "fatigue_load_limit_kN": 114, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 27000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2326 K/VE240 is the dimension series 23 CARB toroidal roller bearings member of the CARB range: 130 mm bore, 280 mm OD, 93 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 2326 K/VE240 separates into C (CARB), 23 (dimension series), 130 mm (slash-size) (130 mm bore — bore 130 mm is written directly after the slash) and K/VE240 (tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage)); envelope 130×280×93 mm follows the ISO 15 plan. The V suffix denotes a full complement: the toroidal rollers fill the 93 mm space without a cage, raising C to 980 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Selection arithmetic: C 980 kN against C0 1220 kN gives a C0/C ratio of 1.24, and the 114 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 93 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 130 mm bore, shaft expansion is already measurable: calculate the required float inside the 93 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 2326 K/VE240 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 130 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2326 K/VE240 must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the 2,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 980/1220 kN ratings and 27000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 2326 K/VE240 designation read?", "a": "C = CARB toroidal family; 23 = dimension series; 130 mm (slash-size) = 130 mm bore (the bore is written directly after the slash (no bore code)); suffix K/VE240 selects tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (980 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2326 K/VE240 is the tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage)." }, { "q": "How is C 2326 K/VE240 mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2326 K/VE240?", "a": "A C 2326 K/VE240 measures 130 mm bore × 280 mm outside diameter × 93 mm width (5.118 × 11.024 × 3.661 in). From SKF catalogue PUB BU/P1 17000: dynamic C 980 kN, static C0 1220 kN, fatigue limit Pu 114 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 27000 g." } ], "cross_ref": [ { "equiv_sku": "22326", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×93 mm envelope as the SKF spherical roller bearing SKF 22326 CC/W33, but catalogue C/C0 differ (980/1220 kN vs 1176/1320 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22326-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×93 mm envelope as the SKF spherical roller bearing SKF 22326 CCK/W33, but catalogue C/C0 differ (980/1220 kN vs 1176/1320 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2326-K-VE240", "C 2326 K/VE240" ], "locale_variants": {} }, { "sku": "C4028-V", "brand": "SKF", "manufacturer_designation": "C 4028 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 140, "D_mm": 210, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 750, "static_load_kN": 1220, "fatigue_load_limit_kN": 120, "limiting_speed_rpm": 800, "max_rpm": 800, "weight_g": 8600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 4028 V: the toroidal rollers allow the 140 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 4028 V the 40 dimension series fixes the 210 mm OD and 69 mm width around the 140 mm bore (code 28 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The cylindrical 140 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 140×210×69 mm are identical — only the mounting method changes. The 8600 g mass over the 140×210×69 mm envelope yields about 5.36 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 140 mm bore, shaft expansion is already measurable: calculate the required float inside the 69 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 750/1220 kN ratings belong to this exact execution (C 4028 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4028 V must float; the two are designed to be used as a pair.", "The 750/1220 kN ratings and 8600 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 4028 V locate the shaft axially?", "a": "No — that is the defining feature. C 4028 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4028 V designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 28 = 140 mm bore (code 28 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (750 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4028 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 4028 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 140 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 69 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C4028-K30V", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×69 mm ISO 15 envelope and equivalent catalogue C/C0; C 4028 K30V is the 1:30 tapered-bore K30 full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24028", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×69 mm envelope as the SKF spherical roller bearing SKF 24028 CC/W33, but catalogue C/C0 differ (750/1220 kN vs 600/900 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24028-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×69 mm envelope as the SKF spherical roller bearing SKF 24028 CCK30/W33, but catalogue C/C0 differ (750/1220 kN vs 600/900 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4028-V", "C 4028 V" ], "locale_variants": {} }, { "sku": "C4028-K30V", "brand": "SKF", "manufacturer_designation": "C 4028 K30V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 140, "D_mm": 210, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 750, "static_load_kN": 1220, "fatigue_load_limit_kN": 120, "limiting_speed_rpm": 800, "max_rpm": 800, "weight_g": 8600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 4028 K30V denotes a toroidal roller bearing whose 69 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 4028 K30V separates into C (CARB), 40 (dimension series), 28 (140 mm bore) and K30V (tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)); envelope 140×210×69 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 140 mm shaft deflects; no reference speed is listed and the limiting speed is 800 r/min. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 800 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 69 mm wide cavity does not fill itself.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 140 mm bore, shaft expansion is already measurable: calculate the required float inside the 69 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 750/1220 kN ratings belong to this exact execution (C 4028 K30V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 4028 K30V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 140 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 750/1220 kN ratings and 8600 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 4028 K30V?", "a": "A C 4028 K30V measures 140 mm bore × 210 mm outside diameter × 69 mm width (5.512 × 8.268 × 2.717 in). From SKF catalogue PUB BU/P1 17000: dynamic C 750 kN, static C0 1220 kN, fatigue limit Pu 120 kN, limiting speed 800 r/min, no reference speed listed, mass about 8600 g." }, { "q": "Can a CARB bearing like C 4028 K30V locate the shaft axially?", "a": "No — that is the defining feature. C 4028 K30V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4028 K30V designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 28 = 140 mm bore (code 28 × 5); suffix K30V selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (750 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4028 K30V is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)." } ], "cross_ref": [ { "equiv_sku": "C4028-V", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×69 mm ISO 15 envelope and equivalent catalogue C/C0; C 4028 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24028", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×69 mm envelope as the SKF spherical roller bearing SKF 24028 CC/W33, but catalogue C/C0 differ (750/1220 kN vs 600/900 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24028-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×69 mm envelope as the SKF spherical roller bearing SKF 24028 CCK30/W33, but catalogue C/C0 differ (750/1220 kN vs 600/900 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4028-K30V", "C 4028 K30V" ], "locale_variants": {} }, { "sku": "C4128-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 4128-2CS5V/GEM9", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 140, "D_mm": 225, "B_mm": 85, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 780, "static_load_kN": 1200, "fatigue_load_limit_kN": 116, "limiting_speed_rpm": 63, "max_rpm": 63, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 4128-2CS5V/GEM9 in the dimension series 41 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 4128 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here 2CS5V/GEM9. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 140 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 85 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 140 mm bore, shaft expansion is already measurable: calculate the required float inside the 85 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 140 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 780/1200 kN ratings belong to this exact execution (C 4128-2CS5V/GEM9); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 4128-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 780/1200 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 4128-2CS5V/GEM9 sealed?", "a": "Yes — this is a sealed full-complement execution (2CS5V contact seals with annular groove), greased at the factory; the catalogue lists no reference speed and the limiting speed is 63 r/min." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4128-2CS5V/GEM9 have?", "a": "A C 4128-2CS5V/GEM9 measures 140 mm bore × 225 mm outside diameter × 85 mm width (5.512 × 8.858 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 780 kN, static C0 1200 kN, fatigue limit Pu 116 kN, limiting speed 63 r/min, no reference speed listed, mass about 12500 g." }, { "q": "What does C 4128-2CS5V/GEM9 mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 140 mm bore; 2CS5V/GEM9 is the execution (cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C4128-V-VE240", "equiv_brand": "SKF", "level": "full", "note": "Same 140×225×85 mm ISO 15 envelope and equivalent catalogue C/C0; C 4128 V/VE240 is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24128", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (140×225×85 mm) SKF spherical roller bearing SKF 24128 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24128 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24128-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (140×225×85 mm) SKF spherical roller bearing SKF 24128 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24128 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4128-2CS5V-GEM9", "C 4128-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C4128-V-VE240", "brand": "SKF", "manufacturer_designation": "C 4128 V/VE240", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 140, "D_mm": 225, "B_mm": 85, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 780, "static_load_kN": 1200, "fatigue_load_limit_kN": 116, "limiting_speed_rpm": 800, "max_rpm": 800, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4128 V/VE240 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 140×225×85 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 4128 V/VE240 separates into C (CARB), 41 (dimension series), 140 mm (slash-size) (140 mm bore — bore 140 mm is written directly after the slash) and V/VE240 (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 140×225×85 mm follows the ISO 15 plan. The V suffix denotes a full complement: the toroidal rollers fill the 85 mm space without a cage, raising C to 780 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 85 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 85 mm wide cavity does not fill itself.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 140 mm bore, shaft expansion is already measurable: calculate the required float inside the 85 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4128 V/VE240 must float; the two are designed to be used as a pair.", "Never use C 4128 V/VE240 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 140 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 780/1200 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 4128 V/VE240 designation read?", "a": "C = CARB toroidal family; 41 = dimension series; 140 mm (slash-size) = 140 mm bore (the bore is written directly after the slash (no bore code)); suffix V/VE240 selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (780 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4128 V/VE240 is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." }, { "q": "How is C 4128 V/VE240 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 140 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 85 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4128 V/VE240?", "a": "A C 4128 V/VE240 measures 140 mm bore × 225 mm outside diameter × 85 mm width (5.512 × 8.858 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 780 kN, static C0 1200 kN, fatigue limit Pu 116 kN, limiting speed 800 r/min, no reference speed listed, mass about 12500 g." } ], "cross_ref": [ { "equiv_sku": "C4128-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "Same 140×225×85 mm ISO 15 envelope and equivalent catalogue C/C0; C 4128-2CS5V/GEM9 is the cylindrical-bore sealed full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24128", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (140×225×85 mm) SKF spherical roller bearing SKF 24128 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24128 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24128-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (140×225×85 mm) SKF spherical roller bearing SKF 24128 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24128 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4128-V-VE240", "C 4128 V/VE240" ], "locale_variants": {} }, { "sku": "C2228", "brand": "SKF", "manufacturer_designation": "C 2228", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 830, "static_load_kN": 1060, "fatigue_load_limit_kN": 102, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 2228 in the dimension series 22 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. The designation C 2228 separates into C (CARB), 22 (dimension series), 28 (140 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 140×250×68 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 140 mm seat. Selection arithmetic: C 830 kN against C0 1060 kN gives a C0/C ratio of 1.28, and the 102 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 140 mm seat or heat it (max 120 °C) and seat it square; never press through the 68 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 140 mm bore, shaft expansion is already measurable: calculate the required float inside the 68 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the 2,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 830/1060 kN ratings belong to this exact execution (C 2228); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 2228 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 830/1060 kN ratings and 14000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 2228 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 28 = 140 mm bore (code 28 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (830 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2228 is the cylindrical bore for direct shaft fitting, pressed steel cage." }, { "q": "How is C 2228 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 140 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 68 mm roller set." }, { "q": "What are the dimensions and ratings of the C 2228?", "a": "A C 2228 measures 140 mm bore × 250 mm outside diameter × 68 mm width (5.512 × 9.843 × 2.677 in). From SKF catalogue PUB BU/P1 17000: dynamic C 830 kN, static C0 1060 kN, fatigue limit Pu 102 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 14000 g." } ], "cross_ref": [ { "equiv_sku": "C2228-K", "equiv_brand": "SKF", "level": "full", "note": "Same 140×250×68 mm ISO 15 envelope and equivalent catalogue C/C0; C 2228 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22228", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×68 mm envelope as the SKF spherical roller bearing SKF 22228 CC/W33, but catalogue C/C0 differ (830/1060 kN vs 743/900 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22228-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×68 mm envelope as the SKF spherical roller bearing SKF 22228 CCK/W33, but catalogue C/C0 differ (830/1060 kN vs 743/900 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2228", "C 2228" ], "locale_variants": {} }, { "sku": "C2228-K", "brand": "SKF", "manufacturer_designation": "C 2228 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 830, "static_load_kN": 1060, "fatigue_load_limit_kN": 102, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2228 K combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 140 mm bore, 250 mm outside diameter, 68 mm wide unit rated 830 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 2228 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 140 mm shaft deflects; the 2,400 r/min reference and 3,200 r/min limiting speed are both catalogue values. Speed planning separates the 2,400 r/min thermal reference from the 3,200 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 68 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 140 mm bore, shaft expansion is already measurable: calculate the required float inside the 68 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2228 K must float; the two are designed to be used as a pair.", "Never use C 2228 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 140 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 830/1060 kN ratings and 14000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2228 K have?", "a": "A C 2228 K measures 140 mm bore × 250 mm outside diameter × 68 mm width (5.512 × 9.843 × 2.677 in). From SKF catalogue PUB BU/P1 17000: dynamic C 830 kN, static C0 1060 kN, fatigue limit Pu 102 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 14000 g." }, { "q": "What does C 2228 K mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 140 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2228 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C2228", "equiv_brand": "SKF", "level": "full", "note": "Same 140×250×68 mm ISO 15 envelope and equivalent catalogue C/C0; C 2228 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22228", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×68 mm envelope as the SKF spherical roller bearing SKF 22228 CC/W33, but catalogue C/C0 differ (830/1060 kN vs 743/900 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22228-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×68 mm envelope as the SKF spherical roller bearing SKF 22228 CCK/W33, but catalogue C/C0 differ (830/1060 kN vs 743/900 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2228-K", "C 2228 K" ], "locale_variants": {} }, { "sku": "C3030-MB", "brand": "SKF", "manufacturer_designation": "C 3030 MB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 540, "static_load_kN": 850, "fatigue_load_limit_kN": 81.5, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 8450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3030 MB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 150×225×56 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (30) encode the 150 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 150 mm seat. Selection arithmetic: C 540 kN against C0 850 kN gives a C0/C ratio of 1.57, and the 81.5 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 150 mm seat or heat it (max 120 °C) and seat it square; never press through the 56 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 56 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 150 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 540/850 kN ratings belong to this exact execution (C 3030 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 540/850 kN ratings and 8450 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 3030 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3030 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3030 MB have?", "a": "A C 3030 MB measures 150 mm bore × 225 mm outside diameter × 56 mm width (5.906 × 8.858 × 2.205 in). From SKF catalogue PUB BU/P1 17000: dynamic C 540 kN, static C0 850 kN, fatigue limit Pu 81.5 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 8450 g." } ], "cross_ref": [ { "equiv_sku": "C3030-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×56 mm envelope, but catalogue C/C0 differ between the cylindrical-bore MB inner-ring-guided brass-caged and cylindrical-bore full-complement V executions (540/850 kN vs 585/960 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C3030-KV", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×56 mm envelope, but catalogue C/C0 differ between the cylindrical-bore MB inner-ring-guided brass-caged and 1:12 tapered-bore K full-complement V executions (540/850 kN vs 585/960 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "23030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×56 mm envelope as the SKF spherical roller bearing SKF 23030 CC/W33, but catalogue C/C0 differ (540/850 kN vs 531/750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23030-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×56 mm envelope as the SKF spherical roller bearing SKF 23030 CCK/W33, but catalogue C/C0 differ (540/850 kN vs 531/750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3030-MB", "C 3030 MB" ], "locale_variants": {} }, { "sku": "C3030-V", "brand": "SKF", "manufacturer_designation": "C 3030 V", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 585, "static_load_kN": 960, "fatigue_load_limit_kN": 93, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 8000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3030 V is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 150×225×56 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (30) encode the 150 mm bore; suffixes describe bore and execution. The V suffix denotes a full complement: the toroidal rollers fill the 56 mm space without a cage, raising C to 585 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 1,000 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 225 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 56 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3030 V must float; the two are designed to be used as a pair.", "Never use C 3030 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 150 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 585/960 kN ratings and 8000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 3030 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3030 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3030 V have?", "a": "A C 3030 V measures 150 mm bore × 225 mm outside diameter × 56 mm width (5.906 × 8.858 × 2.205 in). From SKF catalogue PUB BU/P1 17000: dynamic C 585 kN, static C0 960 kN, fatigue limit Pu 93 kN, limiting speed 1,000 r/min, no reference speed listed, mass about 8000 g." } ], "cross_ref": [ { "equiv_sku": "C3030-MB", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×56 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore MB inner-ring-guided brass-caged executions (585/960 kN vs 540/850 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C3030-KV", "equiv_brand": "SKF", "level": "full", "note": "Same 150×225×56 mm ISO 15 envelope and equivalent catalogue C/C0; C 3030 KV is the 1:12 tapered-bore K full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×56 mm envelope as the SKF spherical roller bearing SKF 23030 CC/W33, but catalogue C/C0 differ (585/960 kN vs 531/750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23030-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×56 mm envelope as the SKF spherical roller bearing SKF 23030 CCK/W33, but catalogue C/C0 differ (585/960 kN vs 531/750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3030-V", "C 3030 V" ], "locale_variants": {} }, { "sku": "C3030-KV", "brand": "SKF", "manufacturer_designation": "C 3030 KV", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 585, "static_load_kN": 960, "fatigue_load_limit_kN": 93, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 8000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3030 KV denotes a toroidal roller bearing whose 56 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 3030 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KV. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 150 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3030 KV deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 225 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 56 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 585/960 kN ratings belong to this exact execution (C 3030 KV); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 150 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 585/960 kN ratings and 8000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 3030 KV sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3030 KV have?", "a": "A C 3030 KV measures 150 mm bore × 225 mm outside diameter × 56 mm width (5.906 × 8.858 × 2.205 in). From SKF catalogue PUB BU/P1 17000: dynamic C 585 kN, static C0 960 kN, fatigue limit Pu 93 kN, limiting speed 1,000 r/min, no reference speed listed, mass about 8000 g." }, { "q": "What does C 3030 KV mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 150 mm bore; KV is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C3030-MB", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×56 mm envelope, but catalogue C/C0 differ between the 1:12 tapered-bore K full-complement V and cylindrical-bore MB inner-ring-guided brass-caged executions (585/960 kN vs 540/850 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C3030-V", "equiv_brand": "SKF", "level": "full", "note": "Same 150×225×56 mm ISO 15 envelope and equivalent catalogue C/C0; C 3030 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×56 mm envelope as the SKF spherical roller bearing SKF 23030 CC/W33, but catalogue C/C0 differ (585/960 kN vs 531/750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23030-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×56 mm envelope as the SKF spherical roller bearing SKF 23030 CCK/W33, but catalogue C/C0 differ (585/960 kN vs 531/750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3030-KV", "C 3030 KV" ], "locale_variants": {} }, { "sku": "C4030-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 4030-2CS5V/GEM9", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 225, "B_mm": 75, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 585, "static_load_kN": 965, "fatigue_load_limit_kN": 93, "limiting_speed_rpm": 63, "max_rpm": 63, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 4030-2CS5V/GEM9: the toroidal rollers allow the 150 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (150 mm (slash-size)) encode the 150 mm bore; suffixes describe bore and execution. The 2CS5V/GEM9 execution adds nitrile contact seals on both sides plus an annular-groove relubrication feature and a high-viscosity grease fill; the full-complement rollers keep 585 kN dynamic at a reduced 63 r/min ceiling. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 4030-2CS5V/GEM9 deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 75 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 150 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4030-2CS5V/GEM9 must float; the two are designed to be used as a pair.", "The 585/965 kN ratings and 10000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 4030-2CS5V/GEM9 mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 150 mm bore; 2CS5V/GEM9 is the execution (cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4030-2CS5V/GEM9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4030-2CS5V/GEM9 sealed?", "a": "Yes — this is a sealed full-complement execution (2CS5V contact seals with annular groove), greased at the factory; the catalogue lists no reference speed and the limiting speed is 63 r/min." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C4030-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×75 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore full-complement V executions (585/965 kN vs 780/1320 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4030-K30V", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×75 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and 1:30 tapered-bore K30 full-complement V executions (585/965 kN vs 780/1320 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×75 mm envelope as the SKF spherical roller bearing SKF 24030 CC/W33, but catalogue C/C0 differ (585/965 kN vs 680/1040 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24030-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×75 mm envelope as the SKF spherical roller bearing SKF 24030 CCK30/W33, but catalogue C/C0 differ (585/965 kN vs 680/1040 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4030-2CS5V-GEM9", "C 4030-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C4030-V", "brand": "SKF", "manufacturer_designation": "C 4030 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 225, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 780, "static_load_kN": 1320, "fatigue_load_limit_kN": 127, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4030 V belongs to the CARB family — compact aligning roller bearings: envelope 150×225×75 mm, radial rating 780/1320 kN C/C0, and no axial-locating function by design. The designation C 4030 V separates into C (CARB), 40 (dimension series), 30 (150 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 150×225×75 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 150 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 4030 V deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 75 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 780/1320 kN ratings belong to this exact execution (C 4030 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 4030 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 150 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 780/1320 kN ratings and 10500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 4030 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 150 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 75 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4030 V?", "a": "A C 4030 V measures 150 mm bore × 225 mm outside diameter × 75 mm width (5.906 × 8.858 × 2.953 in). From SKF catalogue PUB BU/P1 17000: dynamic C 780 kN, static C0 1320 kN, fatigue limit Pu 127 kN, limiting speed 750 r/min, no reference speed listed, mass about 10500 g." }, { "q": "Can a CARB bearing like C 4030 V locate the shaft axially?", "a": "No — that is the defining feature. C 4030 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4030 V designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 30 = 150 mm bore (code 30 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C4030-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×75 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore sealed full-complement V executions (780/1320 kN vs 585/965 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4030-K30V", "equiv_brand": "SKF", "level": "full", "note": "Same 150×225×75 mm ISO 15 envelope and equivalent catalogue C/C0; C 4030 K30V is the 1:30 tapered-bore K30 full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×75 mm envelope as the SKF spherical roller bearing SKF 24030 CC/W33, but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24030-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×75 mm envelope as the SKF spherical roller bearing SKF 24030 CCK30/W33, but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4030-V", "C 4030 V" ], "locale_variants": {} }, { "sku": "C4030-K30V", "brand": "SKF", "manufacturer_designation": "C 4030 K30V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 225, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 780, "static_load_kN": 1320, "fatigue_load_limit_kN": 127, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4030 K30V is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 150 mm bore, 225 mm OD, 75 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 4030 K30V separates into C (CARB), 40 (dimension series), 30 (150 mm bore) and K30V (tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)); envelope 150×225×75 mm follows the ISO 15 plan. The V suffix denotes a full complement: the toroidal rollers fill the 75 mm space without a cage, raising C to 780 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 75 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 75 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 4030 K30V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 150 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4030 K30V must float; the two are designed to be used as a pair.", "The 780/1320 kN ratings and 10500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 4030 K30V locate the shaft axially?", "a": "No — that is the defining feature. C 4030 K30V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4030 K30V designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 30 = 150 mm bore (code 30 × 5); suffix K30V selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (780 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4030 K30V is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)." }, { "q": "How is C 4030 K30V mounted?", "a": "The tapered 1:30 bore mounts on a withdrawal (AH) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." } ], "cross_ref": [ { "equiv_sku": "C4030-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×75 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore sealed full-complement V executions (780/1320 kN vs 585/965 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4030-V", "equiv_brand": "SKF", "level": "full", "note": "Same 150×225×75 mm ISO 15 envelope and equivalent catalogue C/C0; C 4030 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×75 mm envelope as the SKF spherical roller bearing SKF 24030 CC/W33, but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24030-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×75 mm envelope as the SKF spherical roller bearing SKF 24030 CCK30/W33, but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4030-K30V", "C 4030 K30V" ], "locale_variants": {} }, { "sku": "C3130", "brand": "SKF", "manufacturer_designation": "C 3130", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 250, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 880, "static_load_kN": 1290, "fatigue_load_limit_kN": 122, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 15500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 3130 in the dimension series 31 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. The designation C 3130 separates into C (CARB), 31 (dimension series), 30 (150 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 150×250×80 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 150×250 mm size with 880 kN dynamic and a 2,000 r/min reference speed. The 15500 g mass over the 150×250×80 mm envelope yields about 5.87 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 80 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 80 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the 2,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 880/1290 kN ratings belong to this exact execution (C 3130); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3130 must float; the two are designed to be used as a pair.", "The 880/1290 kN ratings and 15500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 3130 designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 30 = 150 mm bore (code 30 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (880 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3130 is the cylindrical bore for direct shaft fitting, pressed steel cage." }, { "q": "How is C 3130 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 150 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 80 mm roller set." }, { "q": "What are the dimensions and ratings of the C 3130?", "a": "A C 3130 measures 150 mm bore × 250 mm outside diameter × 80 mm width (5.906 × 9.843 × 3.15 in). From SKF catalogue PUB BU/P1 17000: dynamic C 880 kN, static C0 1290 kN, fatigue limit Pu 122 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 15500 g." } ], "cross_ref": [ { "equiv_sku": "C3130-K", "equiv_brand": "SKF", "level": "full", "note": "Same 150×250×80 mm ISO 15 envelope and equivalent catalogue C/C0; C 3130 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23130", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (150×250×80 mm) SKF spherical roller bearing SKF 23130 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23130 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23130-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (150×250×80 mm) SKF spherical roller bearing SKF 23130 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23130 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3130", "C 3130" ], "locale_variants": {} }, { "sku": "C3130-K", "brand": "SKF", "manufacturer_designation": "C 3130 K", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 250, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 880, "static_load_kN": 1290, "fatigue_load_limit_kN": 122, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 15500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3130 K: the toroidal rollers allow the 150 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (30) encode the 150 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 150 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 150×250×80 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3130 K deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 250 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 80 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 880/1290 kN ratings belong to this exact execution (C 3130 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3130 K must float; the two are designed to be used as a pair.", "Never use C 3130 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 880/1290 kN ratings and 15500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3130 K have?", "a": "A C 3130 K measures 150 mm bore × 250 mm outside diameter × 80 mm width (5.906 × 9.843 × 3.15 in). From SKF catalogue PUB BU/P1 17000: dynamic C 880 kN, static C0 1290 kN, fatigue limit Pu 122 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 15500 g." }, { "q": "What does C 3130 K mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 150 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3130 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3130", "equiv_brand": "SKF", "level": "full", "note": "Same 150×250×80 mm ISO 15 envelope and equivalent catalogue C/C0; C 3130 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23130", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (150×250×80 mm) SKF spherical roller bearing SKF 23130 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23130 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23130-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (150×250×80 mm) SKF spherical roller bearing SKF 23130 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23130 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3130-K", "C 3130 K" ], "locale_variants": {} }, { "sku": "C4130-V", "brand": "SKF", "manufacturer_designation": "C 4130 V", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 250, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1220, "static_load_kN": 1860, "fatigue_load_limit_kN": 176, "limiting_speed_rpm": 450, "max_rpm": 450, "weight_g": 20000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4130 V is the dimension series 41 CARB toroidal roller bearings member of the CARB range: 150 mm bore, 250 mm OD, 100 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 4130 V separates into C (CARB), 41 (dimension series), 30 (150 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 150×250×100 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 150 mm shaft deflects; no reference speed is listed and the limiting speed is 450 r/min. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 450 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 150 mm seat or heat it (max 120 °C) and seat it square; never press through the 100 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 100 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 4130 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 150 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4130 V must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 1220/1860 kN ratings and 20000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 4130 V?", "a": "A C 4130 V measures 150 mm bore × 250 mm outside diameter × 100 mm width (5.906 × 9.843 × 3.937 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1220 kN, static C0 1860 kN, fatigue limit Pu 176 kN, limiting speed 450 r/min, no reference speed listed, mass about 20000 g." }, { "q": "Can a CARB bearing like C 4130 V locate the shaft axially?", "a": "No — that is the defining feature. C 4130 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4130 V designation read?", "a": "C = CARB toroidal family; 41 = dimension series; 30 = 150 mm bore (code 30 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1220 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4130 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." } ], "cross_ref": [ { "equiv_sku": "24130", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×250×100 mm envelope as the SKF spherical roller bearing SKF 24130 CC/W33, but catalogue C/C0 differ (1220/1860 kN vs 1054/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24130-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×250×100 mm envelope as the SKF spherical roller bearing SKF 24130 CCK30/W33, but catalogue C/C0 differ (1220/1860 kN vs 1054/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4130-V", "C 4130 V" ], "locale_variants": {} }, { "sku": "C2230", "brand": "SKF", "manufacturer_designation": "C 2230", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 980, "static_load_kN": 1220, "fatigue_load_limit_kN": 114, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 18000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2230: the toroidal rollers allow the 150 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (30) encode the 150 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 150 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 73 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 73 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2230 must float; the two are designed to be used as a pair.", "Never use C 2230 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 150 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 980/1220 kN ratings and 18000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 2230 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 2230 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2230 have?", "a": "A C 2230 measures 150 mm bore × 270 mm outside diameter × 73 mm width (5.906 × 10.63 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 980 kN, static C0 1220 kN, fatigue limit Pu 114 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 18000 g." } ], "cross_ref": [ { "equiv_sku": "C2230-K", "equiv_brand": "SKF", "level": "full", "note": "Same 150×270×73 mm ISO 15 envelope and equivalent catalogue C/C0; C 2230 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22230", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×73 mm envelope as the SKF spherical roller bearing SKF 22230 CC/W33, but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22230-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×73 mm envelope as the SKF spherical roller bearing SKF 22230 CCK/W33, but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2230", "C 2230" ], "locale_variants": {} }, { "sku": "C2230-K", "brand": "SKF", "manufacturer_designation": "C 2230 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 980, "static_load_kN": 1220, "fatigue_load_limit_kN": 114, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 18000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 2230 K denotes a toroidal roller bearing whose 73 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (30) encode the 150 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 150×270 mm size with 980 kN dynamic and a 2,400 r/min reference speed. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 2230 K deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 270 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 73 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2230 K must float; the two are designed to be used as a pair.", "Never use C 2230 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 980/1220 kN ratings belong to this exact execution (C 2230 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 980/1220 kN ratings and 18000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 2230 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2230 K have?", "a": "A C 2230 K measures 150 mm bore × 270 mm outside diameter × 73 mm width (5.906 × 10.63 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 980 kN, static C0 1220 kN, fatigue limit Pu 114 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 18000 g." }, { "q": "What does C 2230 K mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 150 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C2230", "equiv_brand": "SKF", "level": "full", "note": "Same 150×270×73 mm ISO 15 envelope and equivalent catalogue C/C0; C 2230 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "22230", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×73 mm envelope as the SKF spherical roller bearing SKF 22230 CC/W33, but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "22230-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×73 mm envelope as the SKF spherical roller bearing SKF 22230 CCK/W33, but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2230-K", "C 2230 K" ], "locale_variants": {} }, { "sku": "C4032", "brand": "SKF", "manufacturer_designation": "C 4032", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 160, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 765, "static_load_kN": 1160, "fatigue_load_limit_kN": 110, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4032 belongs to the CARB family — compact aligning roller bearings: envelope 160×240×80 mm, radial rating 765/1160 kN C/C0, and no axial-locating function by design. In C 4032 the 40 dimension series fixes the 240 mm OD and 80 mm width around the 160 mm bore (code 32 × 5); the suffix the bare number then selects the cylindrical bore for direct shaft fitting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 160 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 4032 deliberately carries none. Mounting: slide the bearing onto the 160 mm seat or heat it (max 120 °C) and seat it square; never press through the 80 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 160 mm bore, shaft expansion is already measurable: calculate the required float inside the 80 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the 1,700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 765/1160 kN ratings belong to this exact execution (C 4032); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 4032 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 765/1160 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 4032 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 160 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 80 mm roller set." }, { "q": "What are the dimensions and ratings of the C 4032?", "a": "A C 4032 measures 160 mm bore × 240 mm outside diameter × 80 mm width (6.299 × 9.449 × 3.15 in). From SKF catalogue PUB BU/P1 17000: dynamic C 765 kN, static C0 1160 kN, fatigue limit Pu 110 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 12500 g." }, { "q": "Can a CARB bearing like C 4032 locate the shaft axially?", "a": "No — that is the defining feature. C 4032 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4032 designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 32 = 160 mm bore (code 32 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C4032-K30", "equiv_brand": "SKF", "level": "full", "note": "Same 160×240×80 mm ISO 15 envelope and equivalent catalogue C/C0; C 4032 K30 is the 1:30 tapered-bore K30 steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C4032-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the cylindrical-bore steel-caged and cylindrical-bore sealed full-complement V executions (765/1160 kN vs 830/1290 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the cylindrical-bore steel-caged and cylindrical-bore full-complement V executions (765/1160 kN vs 915/1460 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-K30V", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the cylindrical-bore steel-caged and 1:30 tapered-bore K30 full-complement V executions (765/1160 kN vs 915/1460 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24032", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (160×240×80 mm) SKF spherical roller bearing SKF 24032 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24032 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24032-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (160×240×80 mm) SKF spherical roller bearing SKF 24032 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24032 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4032", "C 4032" ], "locale_variants": {} }, { "sku": "C4032-K30", "brand": "SKF", "manufacturer_designation": "C 4032 K30", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 160, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 765, "static_load_kN": 1160, "fatigue_load_limit_kN": 110, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4032 K30 is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 160 mm bore, 240 mm OD, 80 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 4032 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 160 mm shaft deflects; the 1,700 r/min reference and 2,400 r/min limiting speed are both catalogue values. Selection arithmetic: C 765 kN against C0 1160 kN gives a C0/C ratio of 1.52, and the 110 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 240 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 160 mm bore, shaft expansion is already measurable: calculate the required float inside the 80 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4032 K30 must float; the two are designed to be used as a pair.", "Never use C 4032 K30 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 765/1160 kN ratings belong to this exact execution (C 4032 K30); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 765/1160 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 4032 K30 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4032 K30 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4032 K30 have?", "a": "A C 4032 K30 measures 160 mm bore × 240 mm outside diameter × 80 mm width (6.299 × 9.449 × 3.15 in). From SKF catalogue PUB BU/P1 17000: dynamic C 765 kN, static C0 1160 kN, fatigue limit Pu 110 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 12500 g." } ], "cross_ref": [ { "equiv_sku": "C4032", "equiv_brand": "SKF", "level": "full", "note": "Same 160×240×80 mm ISO 15 envelope and equivalent catalogue C/C0; C 4032 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "C4032-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 steel-caged and cylindrical-bore sealed full-complement V executions (765/1160 kN vs 830/1290 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 steel-caged and cylindrical-bore full-complement V executions (765/1160 kN vs 915/1460 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-K30V", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 steel-caged and 1:30 tapered-bore K30 full-complement V executions (765/1160 kN vs 915/1460 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24032", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (160×240×80 mm) SKF spherical roller bearing SKF 24032 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24032 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24032-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (160×240×80 mm) SKF spherical roller bearing SKF 24032 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24032 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4032-K30", "C 4032 K30" ], "locale_variants": {} }, { "sku": "C4032-2CS5V-GEM9", "brand": "SKF", "manufacturer_designation": "C 4032-2CS5V/GEM9", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 160, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 830, "static_load_kN": 1290, "fatigue_load_limit_kN": 122, "limiting_speed_rpm": 60, "max_rpm": 60, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4032-2CS5V/GEM9 belongs to the CARB family — compact aligning roller bearings: envelope 160×240×80 mm, radial rating 830/1290 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (160 mm (slash-size)) encode the 160 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 160 mm seat. Selection arithmetic: C 830 kN against C0 1290 kN gives a C0/C ratio of 1.55, and the 122 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 160 mm bore, shaft expansion is already measurable: calculate the required float inside the 80 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4032-2CS5V/GEM9 must float; the two are designed to be used as a pair.", "Never use C 4032-2CS5V/GEM9 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 160 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 830/1290 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 4032-2CS5V/GEM9 mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 160 mm bore; 2CS5V/GEM9 is the execution (cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4032-2CS5V/GEM9 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4032-2CS5V/GEM9 sealed?", "a": "Yes — this is a sealed full-complement execution (2CS5V contact seals with annular groove), greased at the factory; the catalogue lists no reference speed and the limiting speed is 60 r/min." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C4032", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore steel-caged executions (830/1290 kN vs 765/1160 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-K30", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and 1:30 tapered-bore K30 steel-caged executions (830/1290 kN vs 765/1160 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-V", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore full-complement V executions (830/1290 kN vs 915/1460 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-K30V", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and 1:30 tapered-bore K30 full-complement V executions (830/1290 kN vs 915/1460 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "24032", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (160×240×80 mm) SKF spherical roller bearing SKF 24032 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24032 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24032-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (160×240×80 mm) SKF spherical roller bearing SKF 24032 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24032 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4032-2CS5V-GEM9", "C 4032-2CS5V/GEM9" ], "locale_variants": {} }, { "sku": "C4032-V", "brand": "SKF", "manufacturer_designation": "C 4032 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 160, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 915, "static_load_kN": 1460, "fatigue_load_limit_kN": 140, "limiting_speed_rpm": 600, "max_rpm": 600, "weight_g": 13000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 4032 V: the toroidal rollers allow the 160 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 4032 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The cylindrical 160 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 160×240×80 mm are identical — only the mounting method changes. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 600 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 240 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 160 mm bore, shaft expansion is already measurable: calculate the required float inside the 80 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4032 V must float; the two are designed to be used as a pair.", "Never use C 4032 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 160 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 915/1460 kN ratings and 13000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 4032 V have?", "a": "A C 4032 V measures 160 mm bore × 240 mm outside diameter × 80 mm width (6.299 × 9.449 × 3.15 in). From SKF catalogue PUB BU/P1 17000: dynamic C 915 kN, static C0 1460 kN, fatigue limit Pu 140 kN, limiting speed 600 r/min, no reference speed listed, mass about 13000 g." }, { "q": "What does C 4032 V mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 160 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4032 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4032 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C4032", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore steel-caged executions (915/1460 kN vs 765/1160 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-K30", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and 1:30 tapered-bore K30 steel-caged executions (915/1460 kN vs 765/1160 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the cylindrical-bore full-complement V and cylindrical-bore sealed full-complement V executions (915/1460 kN vs 830/1290 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-K30V", "equiv_brand": "SKF", "level": "full", "note": "Same 160×240×80 mm ISO 15 envelope and equivalent catalogue C/C0; C 4032 K30V is the 1:30 tapered-bore K30 full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24032", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope as the SKF spherical roller bearing SKF 24032 CC/W33, but catalogue C/C0 differ (915/1460 kN vs 783/1200 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24032-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope as the SKF spherical roller bearing SKF 24032 CCK30/W33, but catalogue C/C0 differ (915/1460 kN vs 783/1200 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4032-V", "C 4032 V" ], "locale_variants": {} }, { "sku": "C4032-K30V", "brand": "SKF", "manufacturer_designation": "C 4032 K30V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 160, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 915, "static_load_kN": 1460, "fatigue_load_limit_kN": 140, "limiting_speed_rpm": 600, "max_rpm": 600, "weight_g": 13000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4032 K30V is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 160×240×80 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 4032 K30V separates into C (CARB), 40 (dimension series), 32 (160 mm bore) and K30V (tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)); envelope 160×240×80 mm follows the ISO 15 plan. The K30 suffix gives a 1:30 tapered 160 mm bore, mounted on a withdrawal (AH) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 160×240×80 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 80 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the withdrawal (AH) sleeve matched to the 1:30 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 80 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 160 mm bore, shaft expansion is already measurable: calculate the required float inside the 80 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4032 K30V must float; the two are designed to be used as a pair.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 160 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 915/1460 kN ratings and 13000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 4032 K30V locate the shaft axially?", "a": "No — that is the defining feature. C 4032 K30V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4032 K30V designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 32 = 160 mm bore (code 32 × 5); suffix K30V selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (915 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4032 K30V is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)." }, { "q": "How is C 4032 K30V mounted?", "a": "The tapered 1:30 bore mounts on a withdrawal (AH) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." } ], "cross_ref": [ { "equiv_sku": "C4032", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore steel-caged executions (915/1460 kN vs 765/1160 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-K30", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and 1:30 tapered-bore K30 steel-caged executions (915/1460 kN vs 765/1160 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore sealed full-complement V executions (915/1460 kN vs 830/1290 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "C4032-V", "equiv_brand": "SKF", "level": "full", "note": "Same 160×240×80 mm ISO 15 envelope and equivalent catalogue C/C0; C 4032 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24032", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope as the SKF spherical roller bearing SKF 24032 CC/W33, but catalogue C/C0 differ (915/1460 kN vs 783/1200 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24032-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×80 mm envelope as the SKF spherical roller bearing SKF 24032 CCK30/W33, but catalogue C/C0 differ (915/1460 kN vs 783/1200 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4032-K30V", "C 4032 K30V" ], "locale_variants": {} }, { "sku": "C3132", "brand": "SKF", "manufacturer_designation": "C 3132", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 160, "D_mm": 270, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1000, "static_load_kN": 1400, "fatigue_load_limit_kN": 129, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 21500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3132 denotes a toroidal roller bearing whose 86 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 3132 the 31 dimension series fixes the 270 mm OD and 86 mm width around the 160 mm bore (code 32 × 5); the suffix the bare number then selects the cylindrical bore for direct shaft fitting, pressed steel cage. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 160×270 mm size with 1000 kN dynamic and a 1,900 r/min reference speed. The 21500 g mass over the 160×270×86 mm envelope yields about 6.25 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 160 mm bore, shaft expansion is already measurable: calculate the required float inside the 86 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 3132 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 160 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 1000/1400 kN ratings belong to this exact execution (C 3132); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 1000/1400 kN ratings and 21500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3132?", "a": "A C 3132 measures 160 mm bore × 270 mm outside diameter × 86 mm width (6.299 × 10.63 × 3.386 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1000 kN, static C0 1400 kN, fatigue limit Pu 129 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 21500 g." }, { "q": "Can a CARB bearing like C 3132 locate the shaft axially?", "a": "No — that is the defining feature. C 3132 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3132 designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 32 = 160 mm bore (code 32 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3132 is the cylindrical bore for direct shaft fitting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C3132-K", "equiv_brand": "SKF", "level": "full", "note": "Same 160×270×86 mm ISO 15 envelope and equivalent catalogue C/C0; C 3132 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23132", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (160×270×86 mm) SKF spherical roller bearing SKF 23132 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23132 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23132-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (160×270×86 mm) SKF spherical roller bearing SKF 23132 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23132 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3132", "C 3132" ], "locale_variants": {} }, { "sku": "C3132-K", "brand": "SKF", "manufacturer_designation": "C 3132 K", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 160, "D_mm": 270, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1000, "static_load_kN": 1400, "fatigue_load_limit_kN": 129, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 21500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3132 K is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 160 mm bore, 270 mm OD, 86 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 3132 K separates into C (CARB), 31 (dimension series), 32 (160 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 160×270×86 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 160 mm shaft deflects; the 1,900 r/min reference and 2,600 r/min limiting speed are both catalogue values. Selection arithmetic: C 1000 kN against C0 1400 kN gives a C0/C ratio of 1.40, and the 129 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 270 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 160 mm bore, shaft expansion is already measurable: calculate the required float inside the 86 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 3132 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 160 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3132 K must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the 1,900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 1000/1400 kN ratings and 21500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3132 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3132 K?", "a": "A C 3132 K measures 160 mm bore × 270 mm outside diameter × 86 mm width (6.299 × 10.63 × 3.386 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1000 kN, static C0 1400 kN, fatigue limit Pu 129 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 21500 g." }, { "q": "Can a CARB bearing like C 3132 K locate the shaft axially?", "a": "No — that is the defining feature. C 3132 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3132 K designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 32 = 160 mm bore (code 32 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3132", "equiv_brand": "SKF", "level": "full", "note": "Same 160×270×86 mm ISO 15 envelope and equivalent catalogue C/C0; C 3132 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23132", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (160×270×86 mm) SKF spherical roller bearing SKF 23132 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23132 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23132-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (160×270×86 mm) SKF spherical roller bearing SKF 23132 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23132 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3132-K", "C 3132 K" ], "locale_variants": {} }, { "sku": "C3232", "brand": "SKF", "manufacturer_designation": "C 3232", "series": "C3200-series", "type": "carb_toroidal", "d_mm": 160, "D_mm": 290, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1370, "static_load_kN": 1830, "fatigue_load_limit_kN": 170, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 29500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3232 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 160×290×104 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 3232 separates into C (CARB), 32 (dimension series), 32 (160 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 160×290×104 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 160 mm shaft deflects; the 1,800 r/min reference and 2,400 r/min limiting speed are both catalogue values. The 29500 g mass over the 160×290×104 mm envelope yields about 8.56 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 160 mm bore, shaft expansion is already measurable: calculate the required float inside the 104 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3232 must float; the two are designed to be used as a pair.", "Never use C 3232 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 160 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 1370/1830 kN ratings and 29500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3232?", "a": "A C 3232 measures 160 mm bore × 290 mm outside diameter × 104 mm width (6.299 × 11.417 × 4.094 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1370 kN, static C0 1830 kN, fatigue limit Pu 170 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 29500 g." }, { "q": "Can a CARB bearing like C 3232 locate the shaft axially?", "a": "No — that is the defining feature. C 3232 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3232 designation read?", "a": "C = CARB toroidal family; 32 = dimension series; 32 = 160 mm bore (code 32 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1370 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3232 is the cylindrical bore for direct shaft fitting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C3232-K", "equiv_brand": "SKF", "level": "full", "note": "Same 160×290×104 mm ISO 15 envelope and equivalent catalogue C/C0; C 3232 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23232", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×290×104 mm envelope as the SKF spherical roller bearing SKF 23232 CC/W33, but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23232-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×290×104 mm envelope as the SKF spherical roller bearing SKF 23232 CCK/W33, but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3232", "C 3232" ], "locale_variants": {} }, { "sku": "C3232-K", "brand": "SKF", "manufacturer_designation": "C 3232 K", "series": "C3200-series", "type": "carb_toroidal", "d_mm": 160, "D_mm": 290, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1370, "static_load_kN": 1830, "fatigue_load_limit_kN": 170, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 29500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 3232 K in the dimension series 32 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 3232 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 160×290 mm size with 1370 kN dynamic and a 1,800 r/min reference speed. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 104 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 160 mm bore, shaft expansion is already measurable: calculate the required float inside the 104 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3232 K must float; the two are designed to be used as a pair.", "Never use C 3232 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 160 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 1370/1830 kN ratings and 29500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 3232 K have?", "a": "A C 3232 K measures 160 mm bore × 290 mm outside diameter × 104 mm width (6.299 × 11.417 × 4.094 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1370 kN, static C0 1830 kN, fatigue limit Pu 170 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 29500 g." }, { "q": "What does C 3232 K mean in SKF part numbering?", "a": "C marks CARB; 32 the dimension series; the size code gives 160 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3232 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3232 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C3232", "equiv_brand": "SKF", "level": "full", "note": "Same 160×290×104 mm ISO 15 envelope and equivalent catalogue C/C0; C 3232 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23232", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×290×104 mm envelope as the SKF spherical roller bearing SKF 23232 CC/W33, but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23232-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×290×104 mm envelope as the SKF spherical roller bearing SKF 23232 CCK/W33, but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3232-K", "C 3232 K" ], "locale_variants": {} }, { "sku": "C3034-M", "brand": "SKF", "manufacturer_designation": "C 3034 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 170, "D_mm": 260, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 750, "static_load_kN": 1080, "fatigue_load_limit_kN": 100, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3034 M combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 170 mm bore, 260 mm outside diameter, 67 mm wide unit rated 750 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (34) encode the 170 mm bore; suffixes describe bore and execution. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 170 mm and larger sizes needing robust guidance under heavy load. Selection arithmetic: C 750 kN against C0 1080 kN gives a C0/C ratio of 1.44, and the 100 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 170 mm seat or heat it (max 120 °C) and seat it square; never press through the 67 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 170 mm bore, shaft expansion is already measurable: calculate the required float inside the 67 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 750/1080 kN ratings belong to this exact execution (C 3034 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 3034 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 170 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 750/1080 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 3034 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3034 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3034 M have?", "a": "A C 3034 M measures 170 mm bore × 260 mm outside diameter × 67 mm width (6.693 × 10.236 × 2.638 in). From SKF catalogue PUB BU/P1 17000: dynamic C 750 kN, static C0 1080 kN, fatigue limit Pu 100 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 12500 g." } ], "cross_ref": [ { "equiv_sku": "23034", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (170×260×67 mm) SKF spherical roller bearing SKF 23034 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23034 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23034-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (170×260×67 mm) SKF spherical roller bearing SKF 23034 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23034 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3034-M", "C 3034 M" ], "locale_variants": {} }, { "sku": "C4034-V", "brand": "SKF", "manufacturer_designation": "C 4034 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 170, "D_mm": 260, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1140, "static_load_kN": 1860, "fatigue_load_limit_kN": 173, "limiting_speed_rpm": 500, "max_rpm": 500, "weight_g": 17500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 4034 V in the dimension series 40 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (34) encode the 170 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 170 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 90 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 170 mm seat or heat it (max 120 °C) and seat it square; never press through the 90 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 170 mm bore, shaft expansion is already measurable: calculate the required float inside the 90 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 1140/1860 kN ratings belong to this exact execution (C 4034 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 170 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 1140/1860 kN ratings and 17500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 4034 V have?", "a": "A C 4034 V measures 170 mm bore × 260 mm outside diameter × 90 mm width (6.693 × 10.236 × 3.543 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1140 kN, static C0 1860 kN, fatigue limit Pu 173 kN, limiting speed 500 r/min, no reference speed listed, mass about 17500 g." }, { "q": "What does C 4034 V mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 170 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4034 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4034 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C4034-K30V", "equiv_brand": "SKF", "level": "full", "note": "Same 170×260×90 mm ISO 15 envelope and equivalent catalogue C/C0; C 4034 K30V is the 1:30 tapered-bore K30 full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24034", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×90 mm envelope as the SKF spherical roller bearing SKF 24034 CC/W33, but catalogue C/C0 differ (1140/1860 kN vs 963/1460 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24034-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×90 mm envelope as the SKF spherical roller bearing SKF 24034 CCK30/W33, but catalogue C/C0 differ (1140/1860 kN vs 963/1460 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4034-V", "C 4034 V" ], "locale_variants": {} }, { "sku": "C4034-K30V", "brand": "SKF", "manufacturer_designation": "C 4034 K30V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 170, "D_mm": 260, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1140, "static_load_kN": 1860, "fatigue_load_limit_kN": 173, "limiting_speed_rpm": 500, "max_rpm": 500, "weight_g": 17500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 4034 K30V in the dimension series 40 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 4034 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30V. The K30 suffix gives a 1:30 tapered 170 mm bore, mounted on a withdrawal (AH) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 170×260×90 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 90 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 260 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 170 mm bore, shaft expansion is already measurable: calculate the required float inside the 90 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 1140/1860 kN ratings belong to this exact execution (C 4034 K30V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 4034 K30V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 170 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 1140/1860 kN ratings and 17500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 4034 K30V have?", "a": "A C 4034 K30V measures 170 mm bore × 260 mm outside diameter × 90 mm width (6.693 × 10.236 × 3.543 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1140 kN, static C0 1860 kN, fatigue limit Pu 173 kN, limiting speed 500 r/min, no reference speed listed, mass about 17500 g." }, { "q": "What does C 4034 K30V mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 170 mm bore; K30V is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4034 K30V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4034 K30V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C4034-V", "equiv_brand": "SKF", "level": "full", "note": "Same 170×260×90 mm ISO 15 envelope and equivalent catalogue C/C0; C 4034 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24034", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×90 mm envelope as the SKF spherical roller bearing SKF 24034 CC/W33, but catalogue C/C0 differ (1140/1860 kN vs 963/1460 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24034-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×90 mm envelope as the SKF spherical roller bearing SKF 24034 CCK30/W33, but catalogue C/C0 differ (1140/1860 kN vs 963/1460 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4034-K30V", "C 4034 K30V" ], "locale_variants": {} }, { "sku": "C2234", "brand": "SKF", "manufacturer_designation": "C 2234", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 170, "D_mm": 310, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1270, "static_load_kN": 1630, "fatigue_load_limit_kN": 146, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 28000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2234 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 170 mm bore, 310 mm outside diameter, 86 mm wide unit rated 1270 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (34) encode the 170 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 170 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 86 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 170 mm bore, shaft expansion is already measurable: calculate the required float inside the 86 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 170 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2234 must float; the two are designed to be used as a pair.", "The 1270/1630 kN ratings and 28000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 2234 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2234 have?", "a": "A C 2234 measures 170 mm bore × 310 mm outside diameter × 86 mm width (6.693 × 12.205 × 3.386 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1270 kN, static C0 1630 kN, fatigue limit Pu 146 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 28000 g." }, { "q": "What does C 2234 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 170 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C2234-K", "equiv_brand": "SKF", "level": "full", "note": "Same 170×310×86 mm ISO 15 envelope and equivalent catalogue C/C0; C 2234 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2234", "C 2234" ], "locale_variants": {} }, { "sku": "C2234-K", "brand": "SKF", "manufacturer_designation": "C 2234 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 170, "D_mm": 310, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1270, "static_load_kN": 1630, "fatigue_load_limit_kN": 146, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 28000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2234 K: the toroidal rollers allow the 170 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 2234 K the 22 dimension series fixes the 310 mm OD and 86 mm width around the 170 mm bore (code 34 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 170×310 mm size with 1270 kN dynamic and a 1,900 r/min reference speed. The 28000 g mass over the 170×310×86 mm envelope yields about 7.47 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 310 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 170 mm bore, shaft expansion is already measurable: calculate the required float inside the 86 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 2234 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 170 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The quoted 1270/1630 kN ratings belong to this exact execution (C 2234 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 1270/1630 kN ratings and 28000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1270 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2234 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage." }, { "q": "How is C 2234 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 2234 K?", "a": "A C 2234 K measures 170 mm bore × 310 mm outside diameter × 86 mm width (6.693 × 12.205 × 3.386 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1270 kN, static C0 1630 kN, fatigue limit Pu 146 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 28000 g." }, { "q": "Can a CARB bearing like C 2234 K locate the shaft axially?", "a": "No — that is the defining feature. C 2234 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C2234", "equiv_brand": "SKF", "level": "full", "note": "Same 170×310×86 mm ISO 15 envelope and equivalent catalogue C/C0; C 2234 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2234-K", "C 2234 K" ], "locale_variants": {} }, { "sku": "C3036", "brand": "SKF", "manufacturer_designation": "C 3036", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 180, "D_mm": 280, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 880, "static_load_kN": 1340, "fatigue_load_limit_kN": 122, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3036 denotes a toroidal roller bearing whose 74 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (36) encode the 180 mm bore; suffixes describe bore and execution. The cylindrical 180 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 180×280×74 mm are identical — only the mounting method changes. Speed planning separates the 2,000 r/min thermal reference from the 2,600 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 74 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 880/1340 kN ratings belong to this exact execution (C 3036); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3036 must float; the two are designed to be used as a pair.", "Never use C 3036 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 880/1340 kN ratings and 17000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3036 mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 180 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3036 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3036 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C3036-K", "equiv_brand": "SKF", "level": "full", "note": "Same 180×280×74 mm ISO 15 envelope and equivalent catalogue C/C0; C 3036 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23036", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×280×74 mm) SKF spherical roller bearing SKF 23036 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23036 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23036-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×280×74 mm) SKF spherical roller bearing SKF 23036 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23036 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3036", "C 3036" ], "locale_variants": {} }, { "sku": "C3036-K", "brand": "SKF", "manufacturer_designation": "C 3036 K", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 180, "D_mm": 280, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 880, "static_load_kN": 1340, "fatigue_load_limit_kN": 122, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 3036 K in the dimension series 30 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (36) encode the 180 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 180 mm seat. The 17000 g mass over the 180×280×74 mm envelope yields about 4.89 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 280 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 74 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 880/1340 kN ratings belong to this exact execution (C 3036 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 180 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 2,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 880/1340 kN ratings and 17000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3036 K have?", "a": "A C 3036 K measures 180 mm bore × 280 mm outside diameter × 74 mm width (7.087 × 11.024 × 2.913 in). From SKF catalogue PUB BU/P1 17000: dynamic C 880 kN, static C0 1340 kN, fatigue limit Pu 122 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 17000 g." }, { "q": "What does C 3036 K mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 180 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3036 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3036", "equiv_brand": "SKF", "level": "full", "note": "Same 180×280×74 mm ISO 15 envelope and equivalent catalogue C/C0; C 3036 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23036", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×280×74 mm) SKF spherical roller bearing SKF 23036 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23036 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23036-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×280×74 mm) SKF spherical roller bearing SKF 23036 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23036 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3036-K", "C 3036 K" ], "locale_variants": {} }, { "sku": "C4036-V", "brand": "SKF", "manufacturer_designation": "C 4036 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 180, "D_mm": 280, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1320, "static_load_kN": 2120, "fatigue_load_limit_kN": 196, "limiting_speed_rpm": 430, "max_rpm": 430, "weight_g": 23500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 4036 V combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 180 mm bore, 280 mm outside diameter, 100 mm wide unit rated 1320 kN dynamic. The designation C 4036 V separates into C (CARB), 40 (dimension series), 36 (180 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 180×280×100 mm follows the ISO 15 plan. The V suffix denotes a full complement: the toroidal rollers fill the 100 mm space without a cage, raising C to 1320 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 4036 V deliberately carries none. Mounting: slide the bearing onto the 180 mm seat or heat it (max 120 °C) and seat it square; never press through the 100 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 100 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 4036 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 180 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 1320/2120 kN ratings belong to this exact execution (C 4036 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 1320/2120 kN ratings and 23500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 4036 V?", "a": "A C 4036 V measures 180 mm bore × 280 mm outside diameter × 100 mm width (7.087 × 11.024 × 3.937 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1320 kN, static C0 2120 kN, fatigue limit Pu 196 kN, limiting speed 430 r/min, no reference speed listed, mass about 23500 g." }, { "q": "Can a CARB bearing like C 4036 V locate the shaft axially?", "a": "No — that is the defining feature. C 4036 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4036 V designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 36 = 180 mm bore (code 36 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1320 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4036 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." } ], "cross_ref": [ { "equiv_sku": "24036", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×280×100 mm envelope as the SKF spherical roller bearing SKF 24036 CC/W33, but catalogue C/C0 differ (1320/2120 kN vs 1134/1730 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24036-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×280×100 mm envelope as the SKF spherical roller bearing SKF 24036 CCK30/W33, but catalogue C/C0 differ (1320/2120 kN vs 1134/1730 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4036-V", "C 4036 V" ], "locale_variants": {} }, { "sku": "C3136", "brand": "SKF", "manufacturer_designation": "C 3136", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 180, "D_mm": 300, "B_mm": 96, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1250, "static_load_kN": 1730, "fatigue_load_limit_kN": 156, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 26500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3136 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 180×300×96 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 3136 the 31 dimension series fixes the 300 mm OD and 96 mm width around the 180 mm bore (code 36 × 5); the suffix the bare number then selects the cylindrical bore for direct shaft fitting, pressed steel cage. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 180×300 mm size with 1250 kN dynamic and a 1,700 r/min reference speed. The 26500 g mass over the 180×300×96 mm envelope yields about 6.94 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 96 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Reference and limiting speeds are different limits: the 1,700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 1250/1730 kN ratings belong to this exact execution (C 3136); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3136 must float; the two are designed to be used as a pair.", "The 1250/1730 kN ratings and 26500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3136 locate the shaft axially?", "a": "No — that is the defining feature. C 3136 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3136 designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 36 = 180 mm bore (code 36 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1250 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3136 is the cylindrical bore for direct shaft fitting, pressed steel cage." }, { "q": "How is C 3136 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 180 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 96 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C3136-K", "equiv_brand": "SKF", "level": "full", "note": "Same 180×300×96 mm ISO 15 envelope and equivalent catalogue C/C0; C 3136 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23136", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×300×96 mm) SKF spherical roller bearing SKF 23136 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23136 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23136-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×300×96 mm) SKF spherical roller bearing SKF 23136 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23136 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3136", "C 3136" ], "locale_variants": {} }, { "sku": "C3136-K", "brand": "SKF", "manufacturer_designation": "C 3136 K", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 180, "D_mm": 300, "B_mm": 96, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1250, "static_load_kN": 1730, "fatigue_load_limit_kN": 156, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 26500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3136 K denotes a toroidal roller bearing whose 96 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (36) encode the 180 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 180 mm shaft deflects; the 1,700 r/min reference and 2,400 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3136 K deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 96 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 180 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 3136 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 1250/1730 kN ratings belong to this exact execution (C 3136 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 1250/1730 kN ratings and 26500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 3136 K have?", "a": "A C 3136 K measures 180 mm bore × 300 mm outside diameter × 96 mm width (7.087 × 11.811 × 3.78 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1250 kN, static C0 1730 kN, fatigue limit Pu 156 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 26500 g." }, { "q": "What does C 3136 K mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 180 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3136 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3136 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C3136", "equiv_brand": "SKF", "level": "full", "note": "Same 180×300×96 mm ISO 15 envelope and equivalent catalogue C/C0; C 3136 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23136", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×300×96 mm) SKF spherical roller bearing SKF 23136 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23136 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23136-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×300×96 mm) SKF spherical roller bearing SKF 23136 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23136 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3136-K", "C 3136 K" ], "locale_variants": {} }, { "sku": "C4136-V", "brand": "SKF", "manufacturer_designation": "C 4136 V", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 180, "D_mm": 300, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1760, "static_load_kN": 2700, "fatigue_load_limit_kN": 240, "limiting_speed_rpm": 220, "max_rpm": 220, "weight_g": 34500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4136 V belongs to the CARB family — compact aligning roller bearings: envelope 180×300×118 mm, radial rating 1760/2700 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 4136 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The cylindrical 180 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 180×300×118 mm are identical — only the mounting method changes. The 34500 g mass over the 180×300×118 mm envelope yields about 9.78 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 118 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 118 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4136 V must float; the two are designed to be used as a pair.", "Never use C 4136 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 180 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 1760/2700 kN ratings and 34500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 4136 V mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 180 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4136 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4136 V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "24136", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×300×118 mm envelope as the SKF spherical roller bearing SKF 24136 CC/W33, but catalogue C/C0 differ (1760/2700 kN vs 1449/2160 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24136-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×300×118 mm envelope as the SKF spherical roller bearing SKF 24136 CCK30/W33, but catalogue C/C0 differ (1760/2700 kN vs 1449/2160 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4136-V", "C 4136 V" ], "locale_variants": {} }, { "sku": "C3236", "brand": "SKF", "manufacturer_designation": "C 3236", "series": "C3200-series", "type": "carb_toroidal", "d_mm": 180, "D_mm": 320, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1530, "static_load_kN": 2200, "fatigue_load_limit_kN": 193, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 38000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3236 belongs to the CARB family — compact aligning roller bearings: envelope 180×320×112 mm, radial rating 1530/2200 kN C/C0, and no axial-locating function by design. The designation C 3236 separates into C (CARB), 32 (dimension series), 36 (180 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 180×320×112 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 180 mm shaft deflects; the 1,500 r/min reference and 2,000 r/min limiting speed are both catalogue values. The 38000 g mass over the 180×320×112 mm envelope yields about 8.50 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 112 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 3236 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 180 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3236 must float; the two are designed to be used as a pair.", "The 1530/2200 kN ratings and 38000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3236 locate the shaft axially?", "a": "No — that is the defining feature. C 3236 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3236 designation read?", "a": "C = CARB toroidal family; 32 = dimension series; 36 = 180 mm bore (code 36 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1530 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3236 is the cylindrical bore for direct shaft fitting, pressed steel cage." }, { "q": "How is C 3236 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 180 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 112 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C3236-K", "equiv_brand": "SKF", "level": "full", "note": "Same 180×320×112 mm ISO 15 envelope and equivalent catalogue C/C0; C 3236 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23236", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×320×112 mm) SKF spherical roller bearing SKF 23236 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23236 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23236-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×320×112 mm) SKF spherical roller bearing SKF 23236 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23236 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3236", "C 3236" ], "locale_variants": {} }, { "sku": "C3236-K", "brand": "SKF", "manufacturer_designation": "C 3236 K", "series": "C3200-series", "type": "carb_toroidal", "d_mm": 180, "D_mm": 320, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1530, "static_load_kN": 2200, "fatigue_load_limit_kN": 193, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 38000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3236 K: the toroidal rollers allow the 180 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 3236 K separates into C (CARB), 32 (dimension series), 36 (180 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 180×320×112 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 180×320 mm size with 1530 kN dynamic and a 1,500 r/min reference speed. The 38000 g mass over the 180×320×112 mm envelope yields about 8.50 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 112 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 112 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 3236 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 180 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3236 K must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the 1,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 1530/2200 kN ratings and 38000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3236 K locate the shaft axially?", "a": "No — that is the defining feature. C 3236 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3236 K designation read?", "a": "C = CARB toroidal family; 32 = dimension series; 36 = 180 mm bore (code 36 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1530 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3236 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage." }, { "q": "How is C 3236 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." } ], "cross_ref": [ { "equiv_sku": "C3236", "equiv_brand": "SKF", "level": "full", "note": "Same 180×320×112 mm ISO 15 envelope and equivalent catalogue C/C0; C 3236 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23236", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×320×112 mm) SKF spherical roller bearing SKF 23236 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23236 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23236-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (180×320×112 mm) SKF spherical roller bearing SKF 23236 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23236 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3236-K", "C 3236 K" ], "locale_variants": {} }, { "sku": "C3038", "brand": "SKF", "manufacturer_designation": "C 3038", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 190, "D_mm": 290, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 930, "static_load_kN": 1460, "fatigue_load_limit_kN": 132, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 17500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3038: the toroidal rollers allow the 190 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 3038 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here the bare number. The cylindrical 190 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 190×290×75 mm are identical — only the mounting method changes. Speed planning separates the 1,800 r/min thermal reference from the 2,400 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 75 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 75 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 190 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 3038 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 930/1460 kN ratings belong to this exact execution (C 3038); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 930/1460 kN ratings and 17500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3038 have?", "a": "A C 3038 measures 190 mm bore × 290 mm outside diameter × 75 mm width (7.48 × 11.417 × 2.953 in). From SKF catalogue PUB BU/P1 17000: dynamic C 930 kN, static C0 1460 kN, fatigue limit Pu 132 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 17500 g." }, { "q": "What does C 3038 mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 190 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3038 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3038-K", "equiv_brand": "SKF", "level": "full", "note": "Same 190×290×75 mm ISO 15 envelope and equivalent catalogue C/C0; C 3038 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23038", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (190×290×75 mm) SKF spherical roller bearing SKF 23038 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23038 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23038-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (190×290×75 mm) SKF spherical roller bearing SKF 23038 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23038 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3038", "C 3038" ], "locale_variants": {} }, { "sku": "C3038-K", "brand": "SKF", "manufacturer_designation": "C 3038 K", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 190, "D_mm": 290, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 930, "static_load_kN": 1460, "fatigue_load_limit_kN": 132, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 17500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3038 K combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 190 mm bore, 290 mm outside diameter, 75 mm wide unit rated 930 kN dynamic. The designation C 3038 K separates into C (CARB), 30 (dimension series), 38 (190 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 190×290×75 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 190×290 mm size with 930 kN dynamic and a 1,800 r/min reference speed. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 75 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 290 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 75 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 3038 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 190 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 930/1460 kN ratings belong to this exact execution (C 3038 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 930/1460 kN ratings and 17500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3038 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3038 K?", "a": "A C 3038 K measures 190 mm bore × 290 mm outside diameter × 75 mm width (7.48 × 11.417 × 2.953 in). From SKF catalogue PUB BU/P1 17000: dynamic C 930 kN, static C0 1460 kN, fatigue limit Pu 132 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 17500 g." }, { "q": "Can a CARB bearing like C 3038 K locate the shaft axially?", "a": "No — that is the defining feature. C 3038 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3038 K designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 38 = 190 mm bore (code 38 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3038", "equiv_brand": "SKF", "level": "full", "note": "Same 190×290×75 mm ISO 15 envelope and equivalent catalogue C/C0; C 3038 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23038", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (190×290×75 mm) SKF spherical roller bearing SKF 23038 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23038 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23038-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (190×290×75 mm) SKF spherical roller bearing SKF 23038 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23038 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3038-K", "C 3038 K" ], "locale_variants": {} }, { "sku": "C3138-V", "brand": "SKF", "manufacturer_designation": "C 3138 V", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 190, "D_mm": 320, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1700, "static_load_kN": 2550, "fatigue_load_limit_kN": 224, "limiting_speed_rpm": 190, "max_rpm": 190, "weight_g": 34000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 3138 V in the dimension series 31 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 3138 V the 31 dimension series fixes the 320 mm OD and 104 mm width around the 190 mm bore (code 38 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The cylindrical 190 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 190×320×104 mm are identical — only the mounting method changes. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 190 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 190 mm seat or heat it (max 120 °C) and seat it square; never press through the 104 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 104 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 3138 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 190 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3138 V must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 1700/2550 kN ratings and 34000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3138 V mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 190 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 104 mm roller set." }, { "q": "What are the dimensions and ratings of the C 3138 V?", "a": "A C 3138 V measures 190 mm bore × 320 mm outside diameter × 104 mm width (7.48 × 12.598 × 4.094 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1700 kN, static C0 2550 kN, fatigue limit Pu 224 kN, limiting speed 190 r/min, no reference speed listed, mass about 34000 g." }, { "q": "Can a CARB bearing like C 3138 V locate the shaft axially?", "a": "No — that is the defining feature. C 3138 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3138 V designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 38 = 190 mm bore (code 38 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3138-KV", "equiv_brand": "SKF", "level": "full", "note": "Same 190×320×104 mm ISO 15 envelope and equivalent catalogue C/C0; C 3138 KV is the 1:12 tapered-bore K full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23138", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×320×104 mm envelope as the SKF spherical roller bearing SKF 23138 CC/W33, but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23138-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×320×104 mm envelope as the SKF spherical roller bearing SKF 23138 CCK/W33, but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3138-V", "C 3138 V" ], "locale_variants": {} }, { "sku": "C3138-KV", "brand": "SKF", "manufacturer_designation": "C 3138 KV", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 190, "D_mm": 320, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1700, "static_load_kN": 2550, "fatigue_load_limit_kN": 224, "limiting_speed_rpm": 190, "max_rpm": 190, "weight_g": 34000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 3138 KV in the dimension series 31 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 3138 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KV. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 190 mm seat. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 190 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 320 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 104 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3138 KV must float; the two are designed to be used as a pair.", "Never use C 3138 KV as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 1700/2550 kN ratings belong to this exact execution (C 3138 KV); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 1700/2550 kN ratings and 34000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3138 KV have?", "a": "A C 3138 KV measures 190 mm bore × 320 mm outside diameter × 104 mm width (7.48 × 12.598 × 4.094 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1700 kN, static C0 2550 kN, fatigue limit Pu 224 kN, limiting speed 190 r/min, no reference speed listed, mass about 34000 g." }, { "q": "What does C 3138 KV mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 190 mm bore; KV is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3138 KV used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3138-V", "equiv_brand": "SKF", "level": "full", "note": "Same 190×320×104 mm ISO 15 envelope and equivalent catalogue C/C0; C 3138 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23138", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×320×104 mm envelope as the SKF spherical roller bearing SKF 23138 CC/W33, but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23138-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×320×104 mm envelope as the SKF spherical roller bearing SKF 23138 CCK/W33, but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3138-KV", "C 3138 KV" ], "locale_variants": {} }, { "sku": "C2238", "brand": "SKF", "manufacturer_designation": "C 2238", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 190, "D_mm": 340, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1370, "static_load_kN": 1730, "fatigue_load_limit_kN": 153, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 34500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2238 is the dimension series 22 CARB toroidal roller bearings member of the CARB range: 190 mm bore, 340 mm OD, 92 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (38) encode the 190 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 190 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 92 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 92 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 1370/1730 kN ratings belong to this exact execution (C 2238); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Reference and limiting speeds are different limits: the 1,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 2238 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 1370/1730 kN ratings and 34500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2238 have?", "a": "A C 2238 measures 190 mm bore × 340 mm outside diameter × 92 mm width (7.48 × 13.386 × 3.622 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1370 kN, static C0 1730 kN, fatigue limit Pu 153 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 34500 g." }, { "q": "What does C 2238 mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 190 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2238 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C2238-K", "equiv_brand": "SKF", "level": "full", "note": "Same 190×340×92 mm ISO 15 envelope and equivalent catalogue C/C0; C 2238 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2238", "C 2238" ], "locale_variants": {} }, { "sku": "C2238-K", "brand": "SKF", "manufacturer_designation": "C 2238 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 190, "D_mm": 340, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1370, "static_load_kN": 1730, "fatigue_load_limit_kN": 153, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 34500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 2238 K combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 190 mm bore, 340 mm outside diameter, 92 mm wide unit rated 1370 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 2238 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 190×340 mm size with 1370 kN dynamic and a 1,800 r/min reference speed. Speed planning separates the 1,800 r/min thermal reference from the 2,400 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 92 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 190 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2238 K must float; the two are designed to be used as a pair.", "The 1370/1730 kN ratings and 34500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2238 K have?", "a": "A C 2238 K measures 190 mm bore × 340 mm outside diameter × 92 mm width (7.48 × 13.386 × 3.622 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1370 kN, static C0 1730 kN, fatigue limit Pu 153 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 34500 g." }, { "q": "What does C 2238 K mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 190 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 2238 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C2238", "equiv_brand": "SKF", "level": "full", "note": "Same 190×340×92 mm ISO 15 envelope and equivalent catalogue C/C0; C 2238 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2238-K", "C 2238 K" ], "locale_variants": {} }, { "sku": "C3040", "brand": "SKF", "manufacturer_designation": "C 3040", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 200, "D_mm": 310, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1120, "static_load_kN": 1730, "fatigue_load_limit_kN": 153, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3040 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 200 mm bore, 310 mm outside diameter, 82 mm wide unit rated 1120 kN dynamic. The designation C 3040 separates into C (CARB), 30 (dimension series), 40 (200 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 200×310×82 mm follows the ISO 15 plan. The cylindrical 200 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 200×310×82 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3040 deliberately carries none. Mounting: slide the bearing onto the 200 mm seat or heat it (max 120 °C) and seat it square; never press through the 82 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 82 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3040 must float; the two are designed to be used as a pair.", "The quoted 1120/1730 kN ratings belong to this exact execution (C 3040); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 3040 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 1120/1730 kN ratings and 22500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3040 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 200 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 82 mm roller set." }, { "q": "What are the dimensions and ratings of the C 3040?", "a": "A C 3040 measures 200 mm bore × 310 mm outside diameter × 82 mm width (7.874 × 12.205 × 3.228 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1120 kN, static C0 1730 kN, fatigue limit Pu 153 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 22500 g." }, { "q": "Can a CARB bearing like C 3040 locate the shaft axially?", "a": "No — that is the defining feature. C 3040 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3040 designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 40 = 200 mm bore (code 40 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3040-K", "equiv_brand": "SKF", "level": "full", "note": "Same 200×310×82 mm ISO 15 envelope and equivalent catalogue C/C0; C 3040 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23040", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×310×82 mm envelope as the SKF spherical roller bearing SKF 23040 CC/W33, but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23040-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×310×82 mm envelope as the SKF spherical roller bearing SKF 23040 CCK/W33, but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3040", "C 3040" ], "locale_variants": {} }, { "sku": "C3040-K", "brand": "SKF", "manufacturer_designation": "C 3040 K", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 200, "D_mm": 310, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1120, "static_load_kN": 1730, "fatigue_load_limit_kN": 153, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3040 K denotes a toroidal roller bearing whose 82 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 3040 K the 30 dimension series fixes the 310 mm OD and 82 mm width around the 200 mm bore (code 40 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. The K suffix gives a 1:12 tapered 200 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 200×310×82 mm are identical — only the mounting method changes. Speed planning separates the 1,700 r/min thermal reference from the 2,400 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 82 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Never use C 3040 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 200 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3040 K must float; the two are designed to be used as a pair.", "The 1120/1730 kN ratings and 22500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1120 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3040 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage." }, { "q": "How is C 3040 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3040 K?", "a": "A C 3040 K measures 200 mm bore × 310 mm outside diameter × 82 mm width (7.874 × 12.205 × 3.228 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1120 kN, static C0 1730 kN, fatigue limit Pu 153 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 22500 g." }, { "q": "Can a CARB bearing like C 3040 K locate the shaft axially?", "a": "No — that is the defining feature. C 3040 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C3040", "equiv_brand": "SKF", "level": "full", "note": "Same 200×310×82 mm ISO 15 envelope and equivalent catalogue C/C0; C 3040 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23040", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×310×82 mm envelope as the SKF spherical roller bearing SKF 23040 CC/W33, but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23040-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×310×82 mm envelope as the SKF spherical roller bearing SKF 23040 CCK/W33, but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3040-K", "C 3040 K" ], "locale_variants": {} }, { "sku": "C4040-V", "brand": "SKF", "manufacturer_designation": "C 4040 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 200, "D_mm": 310, "B_mm": 109, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1630, "static_load_kN": 2650, "fatigue_load_limit_kN": 236, "limiting_speed_rpm": 260, "max_rpm": 260, "weight_g": 30500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4040 V belongs to the CARB family — compact aligning roller bearings: envelope 200×310×109 mm, radial rating 1630/2650 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (40) encode the 200 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 200 mm shaft deflects; no reference speed is listed and the limiting speed is 260 r/min. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 109 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 109 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 109 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 1630/2650 kN ratings belong to this exact execution (C 4040 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4040 V must float; the two are designed to be used as a pair.", "Never use C 4040 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 1630/2650 kN ratings and 30500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4040 V have?", "a": "A C 4040 V measures 200 mm bore × 310 mm outside diameter × 109 mm width (7.874 × 12.205 × 4.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1630 kN, static C0 2650 kN, fatigue limit Pu 236 kN, limiting speed 260 r/min, no reference speed listed, mass about 30500 g." }, { "q": "What does C 4040 V mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 200 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4040 V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "24040", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×310×109 mm envelope as the SKF spherical roller bearing SKF 24040 CC/W33, but catalogue C/C0 differ (1630/2650 kN vs 1353/2120 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24040-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×310×109 mm envelope as the SKF spherical roller bearing SKF 24040 CCK30/W33, but catalogue C/C0 differ (1630/2650 kN vs 1353/2120 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4040-V", "C 4040 V" ], "locale_variants": {} }, { "sku": "C3140", "brand": "SKF", "manufacturer_designation": "C 3140", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 200, "D_mm": 340, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1600, "static_load_kN": 2320, "fatigue_load_limit_kN": 200, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 41000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3140 is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 200 mm bore, 340 mm OD, 112 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (40) encode the 200 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 200×340 mm size with 1600 kN dynamic and a 1,500 r/min reference speed. Selection arithmetic: C 1600 kN against C0 2320 kN gives a C0/C ratio of 1.45, and the 200 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 200 mm seat or heat it (max 120 °C) and seat it square; never press through the 112 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 112 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "The quoted 1600/2320 kN ratings belong to this exact execution (C 3140); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 3140 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 200 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 1600/2320 kN ratings and 41000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3140 have?", "a": "A C 3140 measures 200 mm bore × 340 mm outside diameter × 112 mm width (7.874 × 13.386 × 4.409 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1600 kN, static C0 2320 kN, fatigue limit Pu 200 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 41000 g." }, { "q": "What does C 3140 mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 200 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3140 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3140-K", "equiv_brand": "SKF", "level": "full", "note": "Same 200×340×112 mm ISO 15 envelope and equivalent catalogue C/C0; C 3140 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23140", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (200×340×112 mm) SKF spherical roller bearing SKF 23140 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23140 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23140-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (200×340×112 mm) SKF spherical roller bearing SKF 23140 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23140 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3140", "C 3140" ], "locale_variants": {} }, { "sku": "C3140-K", "brand": "SKF", "manufacturer_designation": "C 3140 K", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 200, "D_mm": 340, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1600, "static_load_kN": 2320, "fatigue_load_limit_kN": 200, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 41000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3140 K: the toroidal rollers allow the 200 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 3140 K the 31 dimension series fixes the 340 mm OD and 112 mm width around the 200 mm bore (code 40 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 200 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 112 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 112 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 112 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3140 K must float; the two are designed to be used as a pair.", "The quoted 1600/2320 kN ratings belong to this exact execution (C 3140 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 3140 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 1600/2320 kN ratings and 41000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3140 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3140 K?", "a": "A C 3140 K measures 200 mm bore × 340 mm outside diameter × 112 mm width (7.874 × 13.386 × 4.409 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1600 kN, static C0 2320 kN, fatigue limit Pu 200 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 41000 g." }, { "q": "Can a CARB bearing like C 3140 K locate the shaft axially?", "a": "No — that is the defining feature. C 3140 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3140 K designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 40 = 200 mm bore (code 40 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3140", "equiv_brand": "SKF", "level": "full", "note": "Same 200×340×112 mm ISO 15 envelope and equivalent catalogue C/C0; C 3140 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23140", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (200×340×112 mm) SKF spherical roller bearing SKF 23140 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23140 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23140-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (200×340×112 mm) SKF spherical roller bearing SKF 23140 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23140 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3140-K", "C 3140 K" ], "locale_variants": {} }, { "sku": "C3044", "brand": "SKF", "manufacturer_designation": "C 3044", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 220, "D_mm": 340, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1320, "static_load_kN": 2040, "fatigue_load_limit_kN": 176, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 29500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3044 is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 220 mm bore, 340 mm OD, 90 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 3044 separates into C (CARB), 30 (dimension series), 44 (220 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 220×340×90 mm follows the ISO 15 plan. The cylindrical 220 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 220×340×90 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3044 deliberately carries none. Mounting: slide the bearing onto the 220 mm seat or heat it (max 120 °C) and seat it square; never press through the 90 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (29.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 3044 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 1320/2040 kN ratings belong to this exact execution (C 3044); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 1320/2040 kN ratings and 29500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3044?", "a": "A C 3044 measures 220 mm bore × 340 mm outside diameter × 90 mm width (8.661 × 13.386 × 3.543 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1320 kN, static C0 2040 kN, fatigue limit Pu 176 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 29500 g." }, { "q": "Can a CARB bearing like C 3044 locate the shaft axially?", "a": "No — that is the defining feature. C 3044 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3044 designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 44 = 220 mm bore (code 44 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1320 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3044 is the cylindrical bore for direct shaft fitting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C3044-K", "equiv_brand": "SKF", "level": "full", "note": "Same 220×340×90 mm ISO 15 envelope and equivalent catalogue C/C0; C 3044 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23044", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (220×340×90 mm) SKF spherical roller bearing SKF 23044 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23044 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23044-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (220×340×90 mm) SKF spherical roller bearing SKF 23044 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23044 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3044", "C 3044" ], "locale_variants": {} }, { "sku": "C3044-K", "brand": "SKF", "manufacturer_designation": "C 3044 K", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 220, "D_mm": 340, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1320, "static_load_kN": 2040, "fatigue_load_limit_kN": 176, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 29500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3044 K: the toroidal rollers allow the 220 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 3044 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 220 mm seat. Selection arithmetic: C 1320 kN against C0 2040 kN gives a C0/C ratio of 1.55, and the 176 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 340 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (29.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3044 K must float; the two are designed to be used as a pair.", "Never use C 3044 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 1320/2040 kN ratings and 29500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3044 K have?", "a": "A C 3044 K measures 220 mm bore × 340 mm outside diameter × 90 mm width (8.661 × 13.386 × 3.543 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1320 kN, static C0 2040 kN, fatigue limit Pu 176 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 29500 g." }, { "q": "What does C 3044 K mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 220 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3044 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3044", "equiv_brand": "SKF", "level": "full", "note": "Same 220×340×90 mm ISO 15 envelope and equivalent catalogue C/C0; C 3044 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23044", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (220×340×90 mm) SKF spherical roller bearing SKF 23044 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23044 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23044-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (220×340×90 mm) SKF spherical roller bearing SKF 23044 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23044 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3044-K", "C 3044 K" ], "locale_variants": {} }, { "sku": "C4044-V", "brand": "SKF", "manufacturer_designation": "C 4044 V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 220, "D_mm": 340, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1930, "static_load_kN": 3250, "fatigue_load_limit_kN": 280, "limiting_speed_rpm": 200, "max_rpm": 200, "weight_g": 40000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4044 V is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 220 mm bore, 340 mm OD, 118 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 4044 V the 40 dimension series fixes the 340 mm OD and 118 mm width around the 220 mm bore (code 44 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The V suffix denotes a full complement: the toroidal rollers fill the 118 mm space without a cage, raising C to 1930 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. The 40000 g mass over the 220×340×118 mm envelope yields about 8.77 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 220 mm seat or heat it (max 120 °C) and seat it square; never press through the 118 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (40 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4044 V must float; the two are designed to be used as a pair.", "Never use C 4044 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 1930/3250 kN ratings and 40000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 4044 V?", "a": "A C 4044 V measures 220 mm bore × 340 mm outside diameter × 118 mm width (8.661 × 13.386 × 4.646 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1930 kN, static C0 3250 kN, fatigue limit Pu 280 kN, limiting speed 200 r/min, no reference speed listed, mass about 40000 g." }, { "q": "Can a CARB bearing like C 4044 V locate the shaft axially?", "a": "No — that is the defining feature. C 4044 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4044 V designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 44 = 220 mm bore (code 44 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1930 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4044 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)." } ], "cross_ref": [ { "equiv_sku": "C4044-K30V", "equiv_brand": "SKF", "level": "full", "note": "Same 220×340×118 mm ISO 15 envelope and equivalent catalogue C/C0; C 4044 K30V is the 1:30 tapered-bore K30 full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24044", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×340×118 mm envelope as the SKF spherical roller bearing SKF 24044 CC/W33, but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24044-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×340×118 mm envelope as the SKF spherical roller bearing SKF 24044 CCK30/W33, but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4044-V", "C 4044 V" ], "locale_variants": {} }, { "sku": "C4044-K30V", "brand": "SKF", "manufacturer_designation": "C 4044 K30V", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 220, "D_mm": 340, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1930, "static_load_kN": 3250, "fatigue_load_limit_kN": 280, "limiting_speed_rpm": 200, "max_rpm": 200, "weight_g": 40000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 4044 K30V denotes a toroidal roller bearing whose 118 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 4044 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30V. The V suffix denotes a full complement: the toroidal rollers fill the 118 mm space without a cage, raising C to 1930 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 118 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (40 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 1930/3250 kN ratings belong to this exact execution (C 4044 K30V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4044 K30V must float; the two are designed to be used as a pair.", "Never use C 4044 K30V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 1930/3250 kN ratings and 40000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 4044 K30V have?", "a": "A C 4044 K30V measures 220 mm bore × 340 mm outside diameter × 118 mm width (8.661 × 13.386 × 4.646 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1930 kN, static C0 3250 kN, fatigue limit Pu 280 kN, limiting speed 200 r/min, no reference speed listed, mass about 40000 g." }, { "q": "What does C 4044 K30V mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 220 mm bore; K30V is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4044 K30V used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4044 K30V sealed?", "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue." } ], "cross_ref": [ { "equiv_sku": "C4044-V", "equiv_brand": "SKF", "level": "full", "note": "Same 220×340×118 mm ISO 15 envelope and equivalent catalogue C/C0; C 4044 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24044", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×340×118 mm envelope as the SKF spherical roller bearing SKF 24044 CC/W33, but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "24044-CCK30-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×340×118 mm envelope as the SKF spherical roller bearing SKF 24044 CCK30/W33, but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4044-K30V", "C 4044 K30V" ], "locale_variants": {} }, { "sku": "C3144", "brand": "SKF", "manufacturer_designation": "C 3144", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 220, "D_mm": 370, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1900, "static_load_kN": 2900, "fatigue_load_limit_kN": 245, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 52000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3144 denotes a toroidal roller bearing whose 120 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (44) encode the 220 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 220×370 mm size with 1900 kN dynamic and a 1,400 r/min reference speed. Selection arithmetic: C 1900 kN against C0 2900 kN gives a C0/C ratio of 1.53, and the 245 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 220 mm seat or heat it (max 120 °C) and seat it square; never press through the 120 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (52 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3144 must float; the two are designed to be used as a pair.", "Never use C 3144 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 1900/2900 kN ratings and 52000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 3144 have?", "a": "A C 3144 measures 220 mm bore × 370 mm outside diameter × 120 mm width (8.661 × 14.567 × 4.724 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1900 kN, static C0 2900 kN, fatigue limit Pu 245 kN, reference speed 1,400 r/min, limiting speed 1,800 r/min, mass about 52000 g." }, { "q": "What does C 3144 mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 220 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3144 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3144 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C3144-K", "equiv_brand": "SKF", "level": "full", "note": "Same 220×370×120 mm ISO 15 envelope and equivalent catalogue C/C0; C 3144 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23144", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (220×370×120 mm) SKF spherical roller bearing SKF 23144 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23144 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23144-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (220×370×120 mm) SKF spherical roller bearing SKF 23144 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23144 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3144", "C 3144" ], "locale_variants": {} }, { "sku": "C3144-K", "brand": "SKF", "manufacturer_designation": "C 3144 K", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 220, "D_mm": 370, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1900, "static_load_kN": 2900, "fatigue_load_limit_kN": 245, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 52000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3144 K is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 220×370×120 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 3144 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 220 mm seat. Speed planning separates the 1,400 r/min thermal reference from the 1,800 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 120 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (52 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3144 K must float; the two are designed to be used as a pair.", "Never use C 3144 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 1900/2900 kN ratings belong to this exact execution (C 3144 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 1900/2900 kN ratings and 52000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3144 K have?", "a": "A C 3144 K measures 220 mm bore × 370 mm outside diameter × 120 mm width (8.661 × 14.567 × 4.724 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1900 kN, static C0 2900 kN, fatigue limit Pu 245 kN, reference speed 1,400 r/min, limiting speed 1,800 r/min, mass about 52000 g." }, { "q": "What does C 3144 K mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 220 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3144 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3144", "equiv_brand": "SKF", "level": "full", "note": "Same 220×370×120 mm ISO 15 envelope and equivalent catalogue C/C0; C 3144 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23144", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (220×370×120 mm) SKF spherical roller bearing SKF 23144 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23144 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23144-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (220×370×120 mm) SKF spherical roller bearing SKF 23144 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23144 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3144-K", "C 3144 K" ], "locale_variants": {} }, { "sku": "C2244", "brand": "SKF", "manufacturer_designation": "C 2244", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 220, "D_mm": 400, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2000, "static_load_kN": 2500, "fatigue_load_limit_kN": 208, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 57500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 2244 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 220×400×108 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 2244 the 22 dimension series fixes the 400 mm OD and 108 mm width around the 220 mm bore (code 44 × 5); the suffix the bare number then selects the cylindrical bore for direct shaft fitting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 220 mm seat. Speed planning separates the 1,500 r/min thermal reference from the 2,000 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 400 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (57.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 1,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 2000/2500 kN ratings belong to this exact execution (C 2244); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 2244 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 2000/2500 kN ratings and 57500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 2244?", "a": "A C 2244 measures 220 mm bore × 400 mm outside diameter × 108 mm width (8.661 × 15.748 × 4.252 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2000 kN, static C0 2500 kN, fatigue limit Pu 208 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 57500 g." }, { "q": "Can a CARB bearing like C 2244 locate the shaft axially?", "a": "No — that is the defining feature. C 2244 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 2244 designation read?", "a": "C = CARB toroidal family; 22 = dimension series; 44 = 220 mm bore (code 44 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (2000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2244 is the cylindrical bore for direct shaft fitting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C2244-K", "equiv_brand": "SKF", "level": "full", "note": "Same 220×400×108 mm ISO 15 envelope and equivalent catalogue C/C0; C 2244 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2244", "C 2244" ], "locale_variants": {} }, { "sku": "C2244-K", "brand": "SKF", "manufacturer_designation": "C 2244 K", "series": "C2200-series", "type": "carb_toroidal", "d_mm": 220, "D_mm": 400, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2000, "static_load_kN": 2500, "fatigue_load_limit_kN": 208, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 57500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2244 K: the toroidal rollers allow the 220 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 2244 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The K suffix gives a 1:12 tapered 220 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 220×400×108 mm are identical — only the mounting method changes. Speed planning separates the 1,500 r/min thermal reference from the 2,000 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 108 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (57.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 2244 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 2000/2500 kN ratings belong to this exact execution (C 2244 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 2000/2500 kN ratings and 57500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 2244 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 2244 K have?", "a": "A C 2244 K measures 220 mm bore × 400 mm outside diameter × 108 mm width (8.661 × 15.748 × 4.252 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2000 kN, static C0 2500 kN, fatigue limit Pu 208 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 57500 g." }, { "q": "What does C 2244 K mean in SKF part numbering?", "a": "C marks CARB; 22 the dimension series; the size code gives 220 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C2244", "equiv_brand": "SKF", "level": "full", "note": "Same 220×400×108 mm ISO 15 envelope and equivalent catalogue C/C0; C 2244 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C2244-K", "C 2244 K" ], "locale_variants": {} }, { "sku": "C3048", "brand": "SKF", "manufacturer_designation": "C 3048", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 240, "D_mm": 360, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1340, "static_load_kN": 2160, "fatigue_load_limit_kN": 183, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 32000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3048 denotes a toroidal roller bearing whose 92 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 3048 separates into C (CARB), 30 (dimension series), 48 (240 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 240×360×92 mm follows the ISO 15 plan. The cylindrical 240 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 240×360×92 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3048 deliberately carries none. Mounting: slide the bearing onto the 240 mm seat or heat it (max 120 °C) and seat it square; never press through the 92 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (32 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 1,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 1340/2160 kN ratings belong to this exact execution (C 3048); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3048 must float; the two are designed to be used as a pair.", "Never use C 3048 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 1340/2160 kN ratings and 32000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3048 locate the shaft axially?", "a": "No — that is the defining feature. C 3048 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3048 designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 48 = 240 mm bore (code 48 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1340 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3048 is the cylindrical bore for direct shaft fitting, pressed steel cage." }, { "q": "How is C 3048 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 240 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 92 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C3048-K", "equiv_brand": "SKF", "level": "full", "note": "Same 240×360×92 mm ISO 15 envelope and equivalent catalogue C/C0; C 3048 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23048", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (240×360×92 mm) SKF spherical roller bearing SKF 23048 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23048 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23048-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (240×360×92 mm) SKF spherical roller bearing SKF 23048 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23048 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3048", "C 3048" ], "locale_variants": {} }, { "sku": "C3048-K", "brand": "SKF", "manufacturer_designation": "C 3048 K", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 240, "D_mm": 360, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1340, "static_load_kN": 2160, "fatigue_load_limit_kN": 183, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 32000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3048 K combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 240 mm bore, 360 mm outside diameter, 92 mm wide unit rated 1340 kN dynamic. The designation C 3048 K separates into C (CARB), 30 (dimension series), 48 (240 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 240×360×92 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 240 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 240×360×92 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 92 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 92 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (32 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 1,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 1340/2160 kN ratings belong to this exact execution (C 3048 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3048 K must float; the two are designed to be used as a pair.", "Never use C 3048 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 1340/2160 kN ratings and 32000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3048 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3048 K?", "a": "A C 3048 K measures 240 mm bore × 360 mm outside diameter × 92 mm width (9.449 × 14.173 × 3.622 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1340 kN, static C0 2160 kN, fatigue limit Pu 183 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 32000 g." }, { "q": "Can a CARB bearing like C 3048 K locate the shaft axially?", "a": "No — that is the defining feature. C 3048 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3048 K designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 48 = 240 mm bore (code 48 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3048", "equiv_brand": "SKF", "level": "full", "note": "Same 240×360×92 mm ISO 15 envelope and equivalent catalogue C/C0; C 3048 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23048", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (240×360×92 mm) SKF spherical roller bearing SKF 23048 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23048 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23048-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (240×360×92 mm) SKF spherical roller bearing SKF 23048 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23048 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3048-K", "C 3048 K" ], "locale_variants": {} }, { "sku": "C3148", "brand": "SKF", "manufacturer_designation": "C 3148", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 240, "D_mm": 400, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2320, "static_load_kN": 3450, "fatigue_load_limit_kN": 285, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 64000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3148 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 240×400×128 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (48) encode the 240 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 240×400 mm size with 2320 kN dynamic and a 1,300 r/min reference speed. Selection arithmetic: C 2320 kN against C0 3450 kN gives a C0/C ratio of 1.49, and the 285 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 240 mm seat or heat it (max 120 °C) and seat it square; never press through the 128 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (64 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 240 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3148 must float; the two are designed to be used as a pair.", "Never use C 3148 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 2320/3450 kN ratings and 64000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3148 mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 240 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3148 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3148 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C3148-K", "equiv_brand": "SKF", "level": "full", "note": "Same 240×400×128 mm ISO 15 envelope and equivalent catalogue C/C0; C 3148 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23148", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (240×400×128 mm) SKF spherical roller bearing SKF 23148 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23148 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23148-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (240×400×128 mm) SKF spherical roller bearing SKF 23148 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23148 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3148", "C 3148" ], "locale_variants": {} }, { "sku": "C3148-K", "brand": "SKF", "manufacturer_designation": "C 3148 K", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 240, "D_mm": 400, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2320, "static_load_kN": 3450, "fatigue_load_limit_kN": 285, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 64000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3148 K belongs to the CARB family — compact aligning roller bearings: envelope 240×400×128 mm, radial rating 2320/3450 kN C/C0, and no axial-locating function by design. The designation C 3148 K separates into C (CARB), 31 (dimension series), 48 (240 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 240×400×128 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 240 mm seat. Selection arithmetic: C 2320 kN against C0 3450 kN gives a C0/C ratio of 1.49, and the 285 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 128 mm wide cavity does not fill itself.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (64 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 3148 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 240 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3148 K must float; the two are designed to be used as a pair.", "The 2320/3450 kN ratings and 64000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3148 K?", "a": "A C 3148 K measures 240 mm bore × 400 mm outside diameter × 128 mm width (9.449 × 15.748 × 5.039 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2320 kN, static C0 3450 kN, fatigue limit Pu 285 kN, reference speed 1,300 r/min, limiting speed 1,700 r/min, mass about 64000 g." }, { "q": "Can a CARB bearing like C 3148 K locate the shaft axially?", "a": "No — that is the defining feature. C 3148 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3148 K designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 48 = 240 mm bore (code 48 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (2320 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3148 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C3148", "equiv_brand": "SKF", "level": "full", "note": "Same 240×400×128 mm ISO 15 envelope and equivalent catalogue C/C0; C 3148 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23148", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (240×400×128 mm) SKF spherical roller bearing SKF 23148 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23148 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23148-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (240×400×128 mm) SKF spherical roller bearing SKF 23148 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23148 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3148-K", "C 3148 K" ], "locale_variants": {} }, { "sku": "C3052", "brand": "SKF", "manufacturer_designation": "C 3052", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 260, "D_mm": 400, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1760, "static_load_kN": 2850, "fatigue_load_limit_kN": 232, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 47000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3052 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 260 mm bore, 400 mm outside diameter, 104 mm wide unit rated 1760 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 3052 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here the bare number. The cylindrical 260 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 260×400×104 mm are identical — only the mounting method changes. The 47000 g mass over the 260×400×104 mm envelope yields about 6.77 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 104 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (47 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 1760/2850 kN ratings belong to this exact execution (C 3052); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3052 must float; the two are designed to be used as a pair.", "Never use C 3052 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 1760/2850 kN ratings and 47000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3052 have?", "a": "A C 3052 measures 260 mm bore × 400 mm outside diameter × 104 mm width (10.236 × 15.748 × 4.094 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1760 kN, static C0 2850 kN, fatigue limit Pu 232 kN, reference speed 1,300 r/min, limiting speed 1,800 r/min, mass about 47000 g." }, { "q": "What does C 3052 mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 260 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3052 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3052-K", "equiv_brand": "SKF", "level": "full", "note": "Same 260×400×104 mm ISO 15 envelope and equivalent catalogue C/C0; C 3052 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23052", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×400×104 mm envelope as the SKF spherical roller bearing SKF 23052 CC/W33, but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23052-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×400×104 mm envelope as the SKF spherical roller bearing SKF 23052 CCK/W33, but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3052", "C 3052" ], "locale_variants": {} }, { "sku": "C3052-K", "brand": "SKF", "manufacturer_designation": "C 3052 K", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 260, "D_mm": 400, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1760, "static_load_kN": 2850, "fatigue_load_limit_kN": 232, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 47000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3052 K belongs to the CARB family — compact aligning roller bearings: envelope 260×400×104 mm, radial rating 1760/2850 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (52) encode the 260 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 260×400 mm size with 1760 kN dynamic and a 1,300 r/min reference speed. The 47000 g mass over the 260×400×104 mm envelope yields about 6.77 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 104 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (47 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3052 K must float; the two are designed to be used as a pair.", "Never use C 3052 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Reference and limiting speeds are different limits: the 1,300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 1760/2850 kN ratings belong to this exact execution (C 3052 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 1760/2850 kN ratings and 47000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 3052 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3052 K have?", "a": "A C 3052 K measures 260 mm bore × 400 mm outside diameter × 104 mm width (10.236 × 15.748 × 4.094 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1760 kN, static C0 2850 kN, fatigue limit Pu 232 kN, reference speed 1,300 r/min, limiting speed 1,800 r/min, mass about 47000 g." }, { "q": "What does C 3052 K mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 260 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C3052", "equiv_brand": "SKF", "level": "full", "note": "Same 260×400×104 mm ISO 15 envelope and equivalent catalogue C/C0; C 3052 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23052", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×400×104 mm envelope as the SKF spherical roller bearing SKF 23052 CC/W33, but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23052-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×400×104 mm envelope as the SKF spherical roller bearing SKF 23052 CCK/W33, but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3052-K", "C 3052 K" ], "locale_variants": {} }, { "sku": "C3152", "brand": "SKF", "manufacturer_designation": "C 3152", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 260, "D_mm": 440, "B_mm": 144, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2650, "static_load_kN": 4050, "fatigue_load_limit_kN": 325, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 88000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3152 is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 260 mm bore, 440 mm OD, 144 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 3152 separates into C (CARB), 31 (dimension series), 52 (260 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 260×440×144 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 260×440 mm size with 2650 kN dynamic and a 1,100 r/min reference speed. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 144 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 144 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (88 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 2650/4050 kN ratings belong to this exact execution (C 3152); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3152 must float; the two are designed to be used as a pair.", "The 2650/4050 kN ratings and 88000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3152 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 260 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 144 mm roller set." }, { "q": "What are the dimensions and ratings of the C 3152?", "a": "A C 3152 measures 260 mm bore × 440 mm outside diameter × 144 mm width (10.236 × 17.323 × 5.669 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2650 kN, static C0 4050 kN, fatigue limit Pu 325 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 88000 g." }, { "q": "Can a CARB bearing like C 3152 locate the shaft axially?", "a": "No — that is the defining feature. C 3152 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3152 designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 52 = 260 mm bore (code 52 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3152-K", "equiv_brand": "SKF", "level": "full", "note": "Same 260×440×144 mm ISO 15 envelope and equivalent catalogue C/C0; C 3152 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23152", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (260×440×144 mm) SKF spherical roller bearing SKF 23152 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23152 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23152-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (260×440×144 mm) SKF spherical roller bearing SKF 23152 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23152 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3152", "C 3152" ], "locale_variants": {} }, { "sku": "C3152-K", "brand": "SKF", "manufacturer_designation": "C 3152 K", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 260, "D_mm": 440, "B_mm": 144, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2650, "static_load_kN": 4050, "fatigue_load_limit_kN": 325, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 88000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3152 K belongs to the CARB family — compact aligning roller bearings: envelope 260×440×144 mm, radial rating 2650/4050 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (52) encode the 260 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 260 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3152 K deliberately carries none. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 144 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (88 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 2650/4050 kN ratings belong to this exact execution (C 3152 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 260 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 2650/4050 kN ratings and 88000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3152 K have?", "a": "A C 3152 K measures 260 mm bore × 440 mm outside diameter × 144 mm width (10.236 × 17.323 × 5.669 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2650 kN, static C0 4050 kN, fatigue limit Pu 325 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 88000 g." }, { "q": "What does C 3152 K mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 260 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3152 K used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3152", "equiv_brand": "SKF", "level": "full", "note": "Same 260×440×144 mm ISO 15 envelope and equivalent catalogue C/C0; C 3152 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23152", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (260×440×144 mm) SKF spherical roller bearing SKF 23152 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23152 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23152-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (260×440×144 mm) SKF spherical roller bearing SKF 23152 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23152 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3152-K", "C 3152 K" ], "locale_variants": {} }, { "sku": "C3056", "brand": "SKF", "manufacturer_designation": "C 3056", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 280, "D_mm": 420, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1860, "static_load_kN": 3100, "fatigue_load_limit_kN": 250, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 50500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3056 is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 280 mm bore, 420 mm OD, 106 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 3056 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here the bare number. The cylindrical 280 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 280×420×106 mm are identical — only the mounting method changes. The 50500 g mass over the 280×420×106 mm envelope yields about 6.64 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 106 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (50.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3056 must float; the two are designed to be used as a pair.", "Never use C 3056 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Reference and limiting speeds are different limits: the 1,200 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 1860/3100 kN ratings belong to this exact execution (C 3056); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 1860/3100 kN ratings and 50500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 3056 have?", "a": "A C 3056 measures 280 mm bore × 420 mm outside diameter × 106 mm width (11.024 × 16.535 × 4.173 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1860 kN, static C0 3100 kN, fatigue limit Pu 250 kN, reference speed 1,200 r/min, limiting speed 1,600 r/min, mass about 50500 g." }, { "q": "What does C 3056 mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 280 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3056 used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3056 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C3056-K", "equiv_brand": "SKF", "level": "full", "note": "Same 280×420×106 mm ISO 15 envelope and equivalent catalogue C/C0; C 3056 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23056", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (280×420×106 mm) SKF spherical roller bearing SKF 23056 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23056 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23056-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (280×420×106 mm) SKF spherical roller bearing SKF 23056 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23056 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3056", "C 3056" ], "locale_variants": {} }, { "sku": "C3056-K", "brand": "SKF", "manufacturer_designation": "C 3056 K", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 280, "D_mm": 420, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1860, "static_load_kN": 3100, "fatigue_load_limit_kN": 250, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 50500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3056 K is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 280 mm bore, 420 mm OD, 106 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 3056 K the 30 dimension series fixes the 420 mm OD and 106 mm width around the 280 mm bore (code 56 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. The K suffix gives a 1:12 tapered 280 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 280×420×106 mm are identical — only the mounting method changes. Speed planning separates the 1,200 r/min thermal reference from the 1,600 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 106 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (50.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 3056 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 280 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The quoted 1860/3100 kN ratings belong to this exact execution (C 3056 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 1860/3100 kN ratings and 50500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3056 K mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3056 K?", "a": "A C 3056 K measures 280 mm bore × 420 mm outside diameter × 106 mm width (11.024 × 16.535 × 4.173 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1860 kN, static C0 3100 kN, fatigue limit Pu 250 kN, reference speed 1,200 r/min, limiting speed 1,600 r/min, mass about 50500 g." }, { "q": "Can a CARB bearing like C 3056 K locate the shaft axially?", "a": "No — that is the defining feature. C 3056 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3056 K designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 56 = 280 mm bore (code 56 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3056", "equiv_brand": "SKF", "level": "full", "note": "Same 280×420×106 mm ISO 15 envelope and equivalent catalogue C/C0; C 3056 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23056", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (280×420×106 mm) SKF spherical roller bearing SKF 23056 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23056 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23056-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (280×420×106 mm) SKF spherical roller bearing SKF 23056 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23056 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3056-K", "C 3056 K" ], "locale_variants": {} }, { "sku": "C3156", "brand": "SKF", "manufacturer_designation": "C 3156", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 280, "D_mm": 460, "B_mm": 146, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2850, "static_load_kN": 4500, "fatigue_load_limit_kN": 355, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 94500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3156 denotes a toroidal roller bearing whose 146 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 3156 separates into C (CARB), 31 (dimension series), 56 (280 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 280×460×146 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 280×460 mm size with 2850 kN dynamic and a 1,100 r/min reference speed. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 146 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 146 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (94.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3156 must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 2850/4500 kN ratings belong to this exact execution (C 3156); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 2850/4500 kN ratings and 94500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3156?", "a": "A C 3156 measures 280 mm bore × 460 mm outside diameter × 146 mm width (11.024 × 18.11 × 5.748 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2850 kN, static C0 4500 kN, fatigue limit Pu 355 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 94500 g." }, { "q": "Can a CARB bearing like C 3156 locate the shaft axially?", "a": "No — that is the defining feature. C 3156 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3156 designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 56 = 280 mm bore (code 56 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (2850 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3156 is the cylindrical bore for direct shaft fitting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C3156-K", "equiv_brand": "SKF", "level": "full", "note": "Same 280×460×146 mm ISO 15 envelope and equivalent catalogue C/C0; C 3156 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23156", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (280×460×146 mm) SKF spherical roller bearing SKF 23156 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23156 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23156-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (280×460×146 mm) SKF spherical roller bearing SKF 23156 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23156 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3156", "C 3156" ], "locale_variants": {} }, { "sku": "C3156-K", "brand": "SKF", "manufacturer_designation": "C 3156 K", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 280, "D_mm": 460, "B_mm": 146, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2850, "static_load_kN": 4500, "fatigue_load_limit_kN": 355, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 94500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 3156 K in the dimension series 31 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 3156 K the 31 dimension series fixes the 460 mm OD and 146 mm width around the 280 mm bore (code 56 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 280 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 146 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 146 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (94.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3156 K must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 2850/4500 kN ratings belong to this exact execution (C 3156 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 2850/4500 kN ratings and 94500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3156 K?", "a": "A C 3156 K measures 280 mm bore × 460 mm outside diameter × 146 mm width (11.024 × 18.11 × 5.748 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2850 kN, static C0 4500 kN, fatigue limit Pu 355 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 94500 g." }, { "q": "Can a CARB bearing like C 3156 K locate the shaft axially?", "a": "No — that is the defining feature. C 3156 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3156 K designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 56 = 280 mm bore (code 56 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (2850 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3156 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage." } ], "cross_ref": [ { "equiv_sku": "C3156", "equiv_brand": "SKF", "level": "full", "note": "Same 280×460×146 mm ISO 15 envelope and equivalent catalogue C/C0; C 3156 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23156", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (280×460×146 mm) SKF spherical roller bearing SKF 23156 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23156 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23156-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (280×460×146 mm) SKF spherical roller bearing SKF 23156 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23156 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3156-K", "C 3156 K" ], "locale_variants": {} }, { "sku": "C3060-M", "brand": "SKF", "manufacturer_designation": "C 3060 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 300, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2160, "static_load_kN": 3750, "fatigue_load_limit_kN": 290, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 72000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3060 M denotes a toroidal roller bearing whose 118 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (60) encode the 300 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 300 mm shaft deflects; the 1,100 r/min reference and 1,500 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3060 M deliberately carries none. Mounting: slide the bearing onto the 300 mm seat or heat it (max 120 °C) and seat it square; never press through the 118 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (72 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 3060 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 2160/3750 kN ratings belong to this exact execution (C 3060 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 2160/3750 kN ratings and 72000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 3060 M have?", "a": "A C 3060 M measures 300 mm bore × 460 mm outside diameter × 118 mm width (11.811 × 18.11 × 4.646 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2160 kN, static C0 3750 kN, fatigue limit Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 72000 g." }, { "q": "What does C 3060 M mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 300 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3060 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3060 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C3060-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 300×460×118 mm ISO 15 envelope and equivalent catalogue C/C0; C 3060 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23060", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×460×118 mm) SKF spherical roller bearing SKF 23060 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23060 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23060-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×460×118 mm) SKF spherical roller bearing SKF 23060 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23060 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3060-M", "C 3060 M" ], "locale_variants": {} }, { "sku": "C3060-KM", "brand": "SKF", "manufacturer_designation": "C 3060 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 300, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2160, "static_load_kN": 3750, "fatigue_load_limit_kN": 290, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 72000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3060 KM: the toroidal rollers allow the 300 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 3060 KM separates into C (CARB), 30 (dimension series), 60 (300 mm bore) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 300×460×118 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 300 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 300×460×118 mm are identical — only the mounting method changes. Speed planning separates the 1,100 r/min thermal reference from the 1,500 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 118 mm wide cavity does not fill itself.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (72 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 2160/3750 kN ratings belong to this exact execution (C 3060 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 3060 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 2160/3750 kN ratings and 72000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3060 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3060 KM?", "a": "A C 3060 KM measures 300 mm bore × 460 mm outside diameter × 118 mm width (11.811 × 18.11 × 4.646 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2160 kN, static C0 3750 kN, fatigue limit Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 72000 g." }, { "q": "Can a CARB bearing like C 3060 KM locate the shaft axially?", "a": "No — that is the defining feature. C 3060 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3060 KM designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 60 = 300 mm bore (code 60 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3060-M", "equiv_brand": "SKF", "level": "full", "note": "Same 300×460×118 mm ISO 15 envelope and equivalent catalogue C/C0; C 3060 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23060", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×460×118 mm) SKF spherical roller bearing SKF 23060 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23060 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23060-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×460×118 mm) SKF spherical roller bearing SKF 23060 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23060 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3060-KM", "C 3060 KM" ], "locale_variants": {} }, { "sku": "C4060-M", "brand": "SKF", "manufacturer_designation": "C 4060 M", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 300, "D_mm": 460, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2900, "static_load_kN": 4900, "fatigue_load_limit_kN": 390, "reference_speed_rpm": 900, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 95500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4060 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 300×460×160 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (60) encode the 300 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 300 mm seat. The 95500 g mass over the 300×460×160 mm envelope yields about 9.67 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 300 mm seat or heat it (max 120 °C) and seat it square; never press through the 160 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (95.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 2900/4900 kN ratings belong to this exact execution (C 4060 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 4060 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 2900/4900 kN ratings and 95500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 4060 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4060 M have?", "a": "A C 4060 M measures 300 mm bore × 460 mm outside diameter × 160 mm width (11.811 × 18.11 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 4900 kN, fatigue limit Pu 390 kN, reference speed 900 r/min, limiting speed 1,200 r/min, mass about 95500 g." }, { "q": "What does C 4060 M mean in SKF part numbering?", "a": "C marks CARB; 40 the dimension series; the size code gives 300 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C4060-K30M", "equiv_brand": "SKF", "level": "full", "note": "Same 300×460×160 mm ISO 15 envelope and equivalent catalogue C/C0; C 4060 K30M is the 1:30 tapered-bore K30 M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24060", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×460×160 mm) SKF spherical roller bearing SKF 24060 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24060 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24060-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×460×160 mm) SKF spherical roller bearing SKF 24060 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24060 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4060-M", "C 4060 M" ], "locale_variants": {} }, { "sku": "C4060-K30M", "brand": "SKF", "manufacturer_designation": "C 4060 K30M", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 300, "D_mm": 460, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2900, "static_load_kN": 4900, "fatigue_load_limit_kN": 390, "reference_speed_rpm": 900, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 95500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4060 K30M is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 300 mm bore, 460 mm OD, 160 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 4060 K30M the 40 dimension series fixes the 460 mm OD and 160 mm width around the 300 mm bore (code 60 × 5); the suffix K30M then selects the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 300 mm shaft deflects; the 900 r/min reference and 1,200 r/min limiting speed are both catalogue values. Selection arithmetic: C 2900 kN against C0 4900 kN gives a C0/C ratio of 1.69, and the 390 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (95.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 4060 K30M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4060 K30M must float; the two are designed to be used as a pair.", "The 2900/4900 kN ratings and 95500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 4060 K30M?", "a": "A C 4060 K30M measures 300 mm bore × 460 mm outside diameter × 160 mm width (11.811 × 18.11 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 4900 kN, fatigue limit Pu 390 kN, reference speed 900 r/min, limiting speed 1,200 r/min, mass about 95500 g." }, { "q": "Can a CARB bearing like C 4060 K30M locate the shaft axially?", "a": "No — that is the defining feature. C 4060 K30M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 4060 K30M designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 60 = 300 mm bore (code 60 × 5); suffix K30M selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (2900 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4060 K30M is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage." } ], "cross_ref": [ { "equiv_sku": "C4060-M", "equiv_brand": "SKF", "level": "full", "note": "Same 300×460×160 mm ISO 15 envelope and equivalent catalogue C/C0; C 4060 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24060", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×460×160 mm) SKF spherical roller bearing SKF 24060 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24060 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24060-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×460×160 mm) SKF spherical roller bearing SKF 24060 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24060 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4060-K30M", "C 4060 K30M" ], "locale_variants": {} }, { "sku": "C3160", "brand": "SKF", "manufacturer_designation": "C 3160", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 300, "D_mm": 500, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3250, "static_load_kN": 5200, "fatigue_load_limit_kN": 400, "reference_speed_rpm": 950, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3160 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 300 mm bore, 500 mm outside diameter, 160 mm wide unit rated 3250 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 3160 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here the bare number. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 300×500 mm size with 3250 kN dynamic and a 950 r/min reference speed. Speed planning separates the 950 r/min thermal reference from the 1,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 500 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (125 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3160 must float; the two are designed to be used as a pair.", "Never use C 3160 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 950 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 3250/5200 kN ratings and 125000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 3160 sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3160 have?", "a": "A C 3160 measures 300 mm bore × 500 mm outside diameter × 160 mm width (11.811 × 19.685 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3250 kN, static C0 5200 kN, fatigue limit Pu 400 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 125000 g." }, { "q": "What does C 3160 mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 300 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C3160-K", "equiv_brand": "SKF", "level": "full", "note": "Same 300×500×160 mm ISO 15 envelope and equivalent catalogue C/C0; C 3160 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23160", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×500×160 mm) SKF spherical roller bearing SKF 23160 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23160 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23160-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×500×160 mm) SKF spherical roller bearing SKF 23160 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23160 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3160", "C 3160" ], "locale_variants": {} }, { "sku": "C3160-K", "brand": "SKF", "manufacturer_designation": "C 3160 K", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 300, "D_mm": 500, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3250, "static_load_kN": 5200, "fatigue_load_limit_kN": 400, "reference_speed_rpm": 950, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3160 K denotes a toroidal roller bearing whose 160 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 3160 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 300×500 mm size with 3250 kN dynamic and a 950 r/min reference speed. Speed planning separates the 950 r/min thermal reference from the 1,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (125 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 950 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3160 K must float; the two are designed to be used as a pair.", "The 3250/5200 kN ratings and 125000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 3160 K sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3160 K have?", "a": "A C 3160 K measures 300 mm bore × 500 mm outside diameter × 160 mm width (11.811 × 19.685 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3250 kN, static C0 5200 kN, fatigue limit Pu 400 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 125000 g." }, { "q": "What does C 3160 K mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 300 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C3160", "equiv_brand": "SKF", "level": "full", "note": "Same 300×500×160 mm ISO 15 envelope and equivalent catalogue C/C0; C 3160 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23160", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×500×160 mm) SKF spherical roller bearing SKF 23160 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23160 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23160-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (300×500×160 mm) SKF spherical roller bearing SKF 23160 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23160 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3160-K", "C 3160 K" ], "locale_variants": {} }, { "sku": "C3064-M", "brand": "SKF", "manufacturer_designation": "C 3064 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 320, "D_mm": 480, "B_mm": 121, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2280, "static_load_kN": 4000, "fatigue_load_limit_kN": 305, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 78000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3064 M: the toroidal rollers allow the 320 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 3064 M the 30 dimension series fixes the 480 mm OD and 121 mm width around the 320 mm bore (code 64 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 320 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 121 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (78 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 1,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 2280/4000 kN ratings belong to this exact execution (C 3064 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 3064 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 320 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 2280/4000 kN ratings and 78000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3064 M locate the shaft axially?", "a": "No — that is the defining feature. C 3064 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3064 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 64 = 320 mm bore (code 64 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (2280 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3064 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 3064 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 320 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 121 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C3064-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 320×480×121 mm ISO 15 envelope and equivalent catalogue C/C0; C 3064 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23064", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (320×480×121 mm) SKF spherical roller bearing SKF 23064 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23064 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23064-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (320×480×121 mm) SKF spherical roller bearing SKF 23064 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23064 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3064-M", "C 3064 M" ], "locale_variants": {} }, { "sku": "C3064-KM", "brand": "SKF", "manufacturer_designation": "C 3064 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 320, "D_mm": 480, "B_mm": 121, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2280, "static_load_kN": 4000, "fatigue_load_limit_kN": 305, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 78000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3064 KM denotes a toroidal roller bearing whose 121 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 3064 KM the 30 dimension series fixes the 480 mm OD and 121 mm width around the 320 mm bore (code 64 × 5); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 320 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3064 KM deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (78 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 1,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 2280/4000 kN ratings belong to this exact execution (C 3064 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3064 KM must float; the two are designed to be used as a pair.", "The 2280/4000 kN ratings and 78000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3064 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3064 KM?", "a": "A C 3064 KM measures 320 mm bore × 480 mm outside diameter × 121 mm width (12.598 × 18.898 × 4.764 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2280 kN, static C0 4000 kN, fatigue limit Pu 305 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 78000 g." }, { "q": "Can a CARB bearing like C 3064 KM locate the shaft axially?", "a": "No — that is the defining feature. C 3064 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3064 KM designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 64 = 320 mm bore (code 64 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3064-M", "equiv_brand": "SKF", "level": "full", "note": "Same 320×480×121 mm ISO 15 envelope and equivalent catalogue C/C0; C 3064 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23064", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (320×480×121 mm) SKF spherical roller bearing SKF 23064 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23064 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23064-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (320×480×121 mm) SKF spherical roller bearing SKF 23064 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23064 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3064-KM", "C 3064 KM" ], "locale_variants": {} }, { "sku": "C3164-M", "brand": "SKF", "manufacturer_designation": "C 3164 M", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 320, "D_mm": 540, "B_mm": 176, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4150, "static_load_kN": 6300, "fatigue_load_limit_kN": 480, "reference_speed_rpm": 900, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 164000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3164 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 320×540×176 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 3164 M the 31 dimension series fixes the 540 mm OD and 176 mm width around the 320 mm bore (code 64 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The cylindrical 320 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 320×540×176 mm are identical — only the mounting method changes. Selection arithmetic: C 4150 kN against C0 6300 kN gives a C0/C ratio of 1.52, and the 480 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 320 mm seat or heat it (max 120 °C) and seat it square; never press through the 176 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (164 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 3164 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 320 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 4150/6300 kN ratings belong to this exact execution (C 3164 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 4150/6300 kN ratings and 164000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 3164 M designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 64 = 320 mm bore (code 64 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (4150 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3164 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 3164 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 320 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 176 mm roller set." }, { "q": "What are the dimensions and ratings of the C 3164 M?", "a": "A C 3164 M measures 320 mm bore × 540 mm outside diameter × 176 mm width (12.598 × 21.26 × 6.929 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4150 kN, static C0 6300 kN, fatigue limit Pu 480 kN, reference speed 900 r/min, limiting speed 1,300 r/min, mass about 164000 g." } ], "cross_ref": [ { "equiv_sku": "C3164-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 320×540×176 mm ISO 15 envelope and equivalent catalogue C/C0; C 3164 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23164", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (320×540×176 mm) SKF spherical roller bearing SKF 23164 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23164 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23164-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (320×540×176 mm) SKF spherical roller bearing SKF 23164 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23164 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3164-M", "C 3164 M" ], "locale_variants": {} }, { "sku": "C3164-KM", "brand": "SKF", "manufacturer_designation": "C 3164 KM", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 320, "D_mm": 540, "B_mm": 176, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4150, "static_load_kN": 6300, "fatigue_load_limit_kN": 480, "reference_speed_rpm": 900, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 164000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3164 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 320×540×176 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 3164 KM the 31 dimension series fixes the 540 mm OD and 176 mm width around the 320 mm bore (code 64 × 5); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 320 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 900 r/min thermal reference from the 1,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 176 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (164 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3164 KM must float; the two are designed to be used as a pair.", "Never use C 3164 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 320 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 4150/6300 kN ratings and 164000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3164 KM locate the shaft axially?", "a": "No — that is the defining feature. C 3164 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3164 KM designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 64 = 320 mm bore (code 64 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (4150 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3164 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." }, { "q": "How is C 3164 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." } ], "cross_ref": [ { "equiv_sku": "C3164-M", "equiv_brand": "SKF", "level": "full", "note": "Same 320×540×176 mm ISO 15 envelope and equivalent catalogue C/C0; C 3164 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23164", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (320×540×176 mm) SKF spherical roller bearing SKF 23164 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23164 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23164-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (320×540×176 mm) SKF spherical roller bearing SKF 23164 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23164 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3164-KM", "C 3164 KM" ], "locale_variants": {} }, { "sku": "C3068-M", "brand": "SKF", "manufacturer_designation": "C 3068 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 340, "D_mm": 520, "B_mm": 133, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2900, "static_load_kN": 5000, "fatigue_load_limit_kN": 375, "reference_speed_rpm": 950, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 100000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3068 M combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 340 mm bore, 520 mm outside diameter, 133 mm wide unit rated 2900 kN dynamic. The designation C 3068 M separates into C (CARB), 30 (dimension series), 68 (340 mm bore) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 340×520×133 mm follows the ISO 15 plan. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 340 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 950 r/min thermal reference from the 1,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 340 mm seat or heat it (max 120 °C) and seat it square; never press through the 133 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (100 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 950 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 2900/5000 kN ratings belong to this exact execution (C 3068 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 3068 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 2900/5000 kN ratings and 100000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 3068 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 68 = 340 mm bore (code 68 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (2900 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3068 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 3068 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 340 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 133 mm roller set." }, { "q": "What are the dimensions and ratings of the C 3068 M?", "a": "A C 3068 M measures 340 mm bore × 520 mm outside diameter × 133 mm width (13.386 × 20.472 × 5.236 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 5000 kN, fatigue limit Pu 375 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 100000 g." } ], "cross_ref": [ { "equiv_sku": "C3068-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 340×520×133 mm ISO 15 envelope and equivalent catalogue C/C0; C 3068 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3068-M", "C 3068 M" ], "locale_variants": {} }, { "sku": "C3068-KM", "brand": "SKF", "manufacturer_designation": "C 3068 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 340, "D_mm": 520, "B_mm": 133, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2900, "static_load_kN": 5000, "fatigue_load_limit_kN": 375, "reference_speed_rpm": 950, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 100000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3068 KM is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 340 mm bore, 520 mm OD, 133 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (68) encode the 340 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 340 mm shaft deflects; the 950 r/min reference and 1,300 r/min limiting speed are both catalogue values. Selection arithmetic: C 2900 kN against C0 5000 kN gives a C0/C ratio of 1.72, and the 375 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 133 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (100 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 340 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 950 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 3068 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 2900/5000 kN ratings belong to this exact execution (C 3068 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 2900/5000 kN ratings and 100000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 3068 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3068 KM have?", "a": "A C 3068 KM measures 340 mm bore × 520 mm outside diameter × 133 mm width (13.386 × 20.472 × 5.236 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 5000 kN, fatigue limit Pu 375 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 100000 g." }, { "q": "What does C 3068 KM mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 340 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C3068-M", "equiv_brand": "SKF", "level": "full", "note": "Same 340×520×133 mm ISO 15 envelope and equivalent catalogue C/C0; C 3068 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3068-KM", "C 3068 KM" ], "locale_variants": {} }, { "sku": "C3168-M", "brand": "SKF", "manufacturer_designation": "C 3168 M", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 340, "D_mm": 580, "B_mm": 190, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4900, "static_load_kN": 7500, "fatigue_load_limit_kN": 560, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 205000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3168 M belongs to the CARB family — compact aligning roller bearings: envelope 340×580×190 mm, radial rating 4900/7500 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 3168 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The cylindrical 340 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 340×580×190 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3168 M deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 190 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (205 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 340 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 850 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 4900/7500 kN ratings belong to this exact execution (C 3168 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 3168 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 4900/7500 kN ratings and 205000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 3168 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3168 M have?", "a": "A C 3168 M measures 340 mm bore × 580 mm outside diameter × 190 mm width (13.386 × 22.835 × 7.48 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4900 kN, static C0 7500 kN, fatigue limit Pu 560 kN, reference speed 850 r/min, limiting speed 1,100 r/min, mass about 205000 g." }, { "q": "What does C 3168 M mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 340 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C3168-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 340×580×190 mm ISO 15 envelope and equivalent catalogue C/C0; C 3168 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23168", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×580×190 mm envelope as the SKF spherical roller bearing SKF 23168 CC/W33, but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23168-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×580×190 mm envelope as the SKF spherical roller bearing SKF 23168 CCK/W33, but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3168-M", "C 3168 M" ], "locale_variants": {} }, { "sku": "C3168-KM", "brand": "SKF", "manufacturer_designation": "C 3168 KM", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 340, "D_mm": 580, "B_mm": 190, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4900, "static_load_kN": 7500, "fatigue_load_limit_kN": 560, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 205000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3168 KM denotes a toroidal roller bearing whose 190 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 3168 KM separates into C (CARB), 31 (dimension series), 68 (340 mm bore) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 340×580×190 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 340 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 340×580×190 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 190 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 190 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (205 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3168 KM must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the 850 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 4900/7500 kN ratings belong to this exact execution (C 3168 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 4900/7500 kN ratings and 205000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3168 KM?", "a": "A C 3168 KM measures 340 mm bore × 580 mm outside diameter × 190 mm width (13.386 × 22.835 × 7.48 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4900 kN, static C0 7500 kN, fatigue limit Pu 560 kN, reference speed 850 r/min, limiting speed 1,100 r/min, mass about 205000 g." }, { "q": "Can a CARB bearing like C 3168 KM locate the shaft axially?", "a": "No — that is the defining feature. C 3168 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3168 KM designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 68 = 340 mm bore (code 68 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (4900 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3168 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." } ], "cross_ref": [ { "equiv_sku": "C3168-M", "equiv_brand": "SKF", "level": "full", "note": "Same 340×580×190 mm ISO 15 envelope and equivalent catalogue C/C0; C 3168 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23168", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×580×190 mm envelope as the SKF spherical roller bearing SKF 23168 CC/W33, but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23168-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×580×190 mm envelope as the SKF spherical roller bearing SKF 23168 CCK/W33, but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3168-KM", "C 3168 KM" ], "locale_variants": {} }, { "sku": "C4168-K30MB", "brand": "SKF", "manufacturer_designation": "C 4168 K30MB", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 340, "D_mm": 580, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5600, "static_load_kN": 9150, "fatigue_load_limit_kN": 680, "reference_speed_rpm": 670, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 271000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4168 K30MB is the dimension series 41 CARB toroidal roller bearings member of the CARB range: 340 mm bore, 580 mm OD, 243 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 4168 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30MB. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 340 mm shaft deflects; the 670 r/min reference and 900 r/min limiting speed are both catalogue values. The 271000 g mass over the 340×580×243 mm envelope yields about 16.47 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 580 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (271 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4168 K30MB must float; the two are designed to be used as a pair.", "Never use C 4168 K30MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 5600/9150 kN ratings belong to this exact execution (C 4168 K30MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 5600/9150 kN ratings and 271000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 4168 K30MB have?", "a": "A C 4168 K30MB measures 340 mm bore × 580 mm outside diameter × 243 mm width (13.386 × 22.835 × 9.567 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5600 kN, static C0 9150 kN, fatigue limit Pu 680 kN, reference speed 670 r/min, limiting speed 900 r/min, mass about 271000 g." }, { "q": "What does C 4168 K30MB mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 340 mm bore; K30MB is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4168 K30MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4168 K30MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "24168", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (340×580×243 mm) SKF spherical roller bearing SKF 24168 ECCJ/W33 with ratings within 10 % — not a drop-in substitute: SKF 24168 ECCJ/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24168-ECCK30J-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (340×580×243 mm) SKF spherical roller bearing SKF 24168 ECCK30J/W33 with ratings within 10 % — not a drop-in substitute: SKF 24168 ECCK30J/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4168-K30MB", "C 4168 K30MB" ], "locale_variants": {} }, { "sku": "C3972-M", "brand": "SKF", "manufacturer_designation": "C 3972 M", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 360, "D_mm": 480, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1760, "static_load_kN": 3250, "fatigue_load_limit_kN": 245, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 45000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3972 M is the dimension series 39 CARB toroidal roller bearings member of the CARB range: 360 mm bore, 480 mm OD, 90 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 3972 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 360 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 90 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 90 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (45 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3972 M must float; the two are designed to be used as a pair.", "Never use C 3972 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Reference and limiting speeds are different limits: the 1,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 1760/3250 kN ratings belong to this exact execution (C 3972 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 1760/3250 kN ratings and 45000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3972 M have?", "a": "A C 3972 M measures 360 mm bore × 480 mm outside diameter × 90 mm width (14.173 × 18.898 × 3.543 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1760 kN, static C0 3250 kN, fatigue limit Pu 245 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 45000 g." }, { "q": "What does C 3972 M mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 360 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3972 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3972-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 360×480×90 mm ISO 15 envelope and equivalent catalogue C/C0; C 3972 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23972", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×480×90 mm envelope as the SKF spherical roller bearing SKF 23972 CC/W33, but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23972-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×480×90 mm envelope as the SKF spherical roller bearing SKF 23972 CCK/W33, but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3972-M", "C 3972 M" ], "locale_variants": {} }, { "sku": "C3972-KM", "brand": "SKF", "manufacturer_designation": "C 3972 KM", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 360, "D_mm": 480, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1760, "static_load_kN": 3250, "fatigue_load_limit_kN": 245, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 45000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3972 KM denotes a toroidal roller bearing whose 90 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 3972 KM separates into C (CARB), 39 (dimension series), 72 (360 mm bore) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 360×480×90 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 360 mm shaft deflects; the 1,000 r/min reference and 1,400 r/min limiting speed are both catalogue values. The 45000 g mass over the 360×480×90 mm envelope yields about 4.89 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (45 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 1,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 1760/3250 kN ratings belong to this exact execution (C 3972 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 3972 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 360 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 1760/3250 kN ratings and 45000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3972 KM?", "a": "A C 3972 KM measures 360 mm bore × 480 mm outside diameter × 90 mm width (14.173 × 18.898 × 3.543 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1760 kN, static C0 3250 kN, fatigue limit Pu 245 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 45000 g." }, { "q": "Can a CARB bearing like C 3972 KM locate the shaft axially?", "a": "No — that is the defining feature. C 3972 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3972 KM designation read?", "a": "C = CARB toroidal family; 39 = dimension series; 72 = 360 mm bore (code 72 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (1760 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3972 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." } ], "cross_ref": [ { "equiv_sku": "C3972-M", "equiv_brand": "SKF", "level": "full", "note": "Same 360×480×90 mm ISO 15 envelope and equivalent catalogue C/C0; C 3972 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23972", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×480×90 mm envelope as the SKF spherical roller bearing SKF 23972 CC/W33, but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23972-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×480×90 mm envelope as the SKF spherical roller bearing SKF 23972 CCK/W33, but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3972-KM", "C 3972 KM" ], "locale_variants": {} }, { "sku": "C3072-M", "brand": "SKF", "manufacturer_designation": "C 3072 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 360, "D_mm": 540, "B_mm": 134, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2900, "static_load_kN": 5000, "fatigue_load_limit_kN": 375, "reference_speed_rpm": 900, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 106000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3072 M belongs to the CARB family — compact aligning roller bearings: envelope 360×540×134 mm, radial rating 2900/5000 kN C/C0, and no axial-locating function by design. The designation C 3072 M separates into C (CARB), 30 (dimension series), 72 (360 mm bore) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 360×540×134 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 360 mm shaft deflects; the 900 r/min reference and 1,300 r/min limiting speed are both catalogue values. Speed planning separates the 900 r/min thermal reference from the 1,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 134 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (106 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 3072 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 360 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 2900/5000 kN ratings belong to this exact execution (C 3072 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 2900/5000 kN ratings and 106000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3072 M locate the shaft axially?", "a": "No — that is the defining feature. C 3072 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3072 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 72 = 360 mm bore (code 72 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (2900 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3072 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 3072 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 360 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 134 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C3072-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 360×540×134 mm ISO 15 envelope and equivalent catalogue C/C0; C 3072 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3072-M", "C 3072 M" ], "locale_variants": {} }, { "sku": "C3072-KM", "brand": "SKF", "manufacturer_designation": "C 3072 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 360, "D_mm": 540, "B_mm": 134, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2900, "static_load_kN": 5000, "fatigue_load_limit_kN": 375, "reference_speed_rpm": 900, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 106000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3072 KM: the toroidal rollers allow the 360 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (72) encode the 360 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 360 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 360×540×134 mm are identical — only the mounting method changes. The 106000 g mass over the 360×540×134 mm envelope yields about 8.06 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 134 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (106 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 2900/5000 kN ratings belong to this exact execution (C 3072 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 360 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 2900/5000 kN ratings and 106000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 3072 KM have?", "a": "A C 3072 KM measures 360 mm bore × 540 mm outside diameter × 134 mm width (14.173 × 21.26 × 5.276 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 5000 kN, fatigue limit Pu 375 kN, reference speed 900 r/min, limiting speed 1,300 r/min, mass about 106000 g." }, { "q": "What does C 3072 KM mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 360 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3072 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3072 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C3072-M", "equiv_brand": "SKF", "level": "full", "note": "Same 360×540×134 mm ISO 15 envelope and equivalent catalogue C/C0; C 3072 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3072-KM", "C 3072 KM" ], "locale_variants": {} }, { "sku": "C3172-M", "brand": "SKF", "manufacturer_designation": "C 3172 M", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 360, "D_mm": 600, "B_mm": 192, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5000, "static_load_kN": 8000, "fatigue_load_limit_kN": 585, "reference_speed_rpm": 800, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 220000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3172 M is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 360 mm bore, 600 mm OD, 192 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 3172 M separates into C (CARB), 31 (dimension series), 72 (360 mm bore) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 360×600×192 mm follows the ISO 15 plan. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 360 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 192 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 600 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (220 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3172 M must float; the two are designed to be used as a pair.", "Never use C 3172 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 360 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 5000/8000 kN ratings and 220000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 3172 M designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 72 = 360 mm bore (code 72 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (5000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3172 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 3172 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 360 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 192 mm roller set." }, { "q": "What are the dimensions and ratings of the C 3172 M?", "a": "A C 3172 M measures 360 mm bore × 600 mm outside diameter × 192 mm width (14.173 × 23.622 × 7.559 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5000 kN, static C0 8000 kN, fatigue limit Pu 585 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 220000 g." } ], "cross_ref": [ { "equiv_sku": "C3172-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 360×600×192 mm ISO 15 envelope and equivalent catalogue C/C0; C 3172 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23172", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×600×192 mm envelope as the SKF spherical roller bearing SKF 23172 CC/W33, but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23172-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×600×192 mm envelope as the SKF spherical roller bearing SKF 23172 CCK/W33, but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3172-M", "C 3172 M" ], "locale_variants": {} }, { "sku": "C3172-KM", "brand": "SKF", "manufacturer_designation": "C 3172 KM", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 360, "D_mm": 600, "B_mm": 192, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5000, "static_load_kN": 8000, "fatigue_load_limit_kN": 585, "reference_speed_rpm": 800, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 220000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3172 KM belongs to the CARB family — compact aligning roller bearings: envelope 360×600×192 mm, radial rating 5000/8000 kN C/C0, and no axial-locating function by design. The designation C 3172 KM separates into C (CARB), 31 (dimension series), 72 (360 mm bore) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 360×600×192 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 360 mm seat. Selection arithmetic: C 5000 kN against C0 8000 kN gives a C0/C ratio of 1.60, and the 585 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (220 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 3172 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 360 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 5000/8000 kN ratings belong to this exact execution (C 3172 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 5000/8000 kN ratings and 220000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 3172 KM designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 72 = 360 mm bore (code 72 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (5000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3172 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." }, { "q": "How is C 3172 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3172 KM?", "a": "A C 3172 KM measures 360 mm bore × 600 mm outside diameter × 192 mm width (14.173 × 23.622 × 7.559 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5000 kN, static C0 8000 kN, fatigue limit Pu 585 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 220000 g." } ], "cross_ref": [ { "equiv_sku": "C3172-M", "equiv_brand": "SKF", "level": "full", "note": "Same 360×600×192 mm ISO 15 envelope and equivalent catalogue C/C0; C 3172 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23172", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×600×192 mm envelope as the SKF spherical roller bearing SKF 23172 CC/W33, but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23172-CCK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×600×192 mm envelope as the SKF spherical roller bearing SKF 23172 CCK/W33, but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3172-KM", "C 3172 KM" ], "locale_variants": {} }, { "sku": "C3076-M", "brand": "SKF", "manufacturer_designation": "C 3076 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 380, "D_mm": 560, "B_mm": 135, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3000, "static_load_kN": 5200, "fatigue_load_limit_kN": 380, "reference_speed_rpm": 900, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 110000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3076 M is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 380 mm bore, 560 mm OD, 135 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 3076 M the 30 dimension series fixes the 560 mm OD and 135 mm width around the 380 mm bore (code 76 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 380 mm shaft deflects; the 900 r/min reference and 1,200 r/min limiting speed are both catalogue values. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 135 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 135 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (110 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 3076 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 380 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 3000/5200 kN ratings belong to this exact execution (C 3076 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 3000/5200 kN ratings and 110000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3076 M locate the shaft axially?", "a": "No — that is the defining feature. C 3076 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3076 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 76 = 380 mm bore (code 76 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (3000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3076 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 3076 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 380 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 135 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C3076-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 380×560×135 mm ISO 15 envelope and equivalent catalogue C/C0; C 3076 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3076-M", "C 3076 M" ], "locale_variants": {} }, { "sku": "C3076-KM", "brand": "SKF", "manufacturer_designation": "C 3076 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 380, "D_mm": 560, "B_mm": 135, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3000, "static_load_kN": 5200, "fatigue_load_limit_kN": 380, "reference_speed_rpm": 900, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 110000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3076 KM denotes a toroidal roller bearing whose 135 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 3076 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The K suffix gives a 1:12 tapered 380 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 380×560×135 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3076 KM deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (110 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 3000/5200 kN ratings belong to this exact execution (C 3076 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3076 KM must float; the two are designed to be used as a pair.", "Never use C 3076 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 3000/5200 kN ratings and 110000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3076 KM have?", "a": "A C 3076 KM measures 380 mm bore × 560 mm outside diameter × 135 mm width (14.961 × 22.047 × 5.315 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3000 kN, static C0 5200 kN, fatigue limit Pu 380 kN, reference speed 900 r/min, limiting speed 1,200 r/min, mass about 110000 g." }, { "q": "What does C 3076 KM mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 380 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3076 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3076-M", "equiv_brand": "SKF", "level": "full", "note": "Same 380×560×135 mm ISO 15 envelope and equivalent catalogue C/C0; C 3076 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3076-KM", "C 3076 KM" ], "locale_variants": {} }, { "sku": "C3176-MB", "brand": "SKF", "manufacturer_designation": "C 3176 MB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 380, "D_mm": 620, "B_mm": 194, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4400, "static_load_kN": 7200, "fatigue_load_limit_kN": 520, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 243000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3176 MB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 380 mm bore, 620 mm OD, 194 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (76) encode the 380 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 380 mm shaft deflects; the 750 r/min reference and 1,000 r/min limiting speed are both catalogue values. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 194 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 194 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (243 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 380 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 750 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3176 MB must float; the two are designed to be used as a pair.", "The 4400/7200 kN ratings and 243000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3176 MB mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 380 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3176 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3176 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C3176-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 380×620×194 mm ISO 15 envelope and equivalent catalogue C/C0; C 3176 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23176", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (380×620×194 mm) SKF spherical roller bearing SKF 23176 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23176 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23176-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (380×620×194 mm) SKF spherical roller bearing SKF 23176 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23176 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3176-MB", "C 3176 MB" ], "locale_variants": {} }, { "sku": "C3176-KMB", "brand": "SKF", "manufacturer_designation": "C 3176 KMB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 380, "D_mm": 620, "B_mm": 194, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4400, "static_load_kN": 7200, "fatigue_load_limit_kN": 520, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 243000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3176 KMB: the toroidal rollers allow the 380 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (76) encode the 380 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 380 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 380×620×194 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3176 KMB deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (243 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3176 KMB must float; the two are designed to be used as a pair.", "Never use C 3176 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 380 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 4400/7200 kN ratings and 243000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3176 KMB have?", "a": "A C 3176 KMB measures 380 mm bore × 620 mm outside diameter × 194 mm width (14.961 × 24.409 × 7.638 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4400 kN, static C0 7200 kN, fatigue limit Pu 520 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 243000 g." }, { "q": "What does C 3176 KMB mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 380 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3176 KMB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3176-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 380×620×194 mm ISO 15 envelope and equivalent catalogue C/C0; C 3176 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23176", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (380×620×194 mm) SKF spherical roller bearing SKF 23176 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23176 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23176-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (380×620×194 mm) SKF spherical roller bearing SKF 23176 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23176 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3176-KMB", "C 3176 KMB" ], "locale_variants": {} }, { "sku": "C3980-KM", "brand": "SKF", "manufacturer_designation": "C 3980 KM", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 400, "D_mm": 540, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2120, "static_load_kN": 4000, "fatigue_load_limit_kN": 290, "reference_speed_rpm": 900, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 66500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3980 KM: the toroidal rollers allow the 400 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 3980 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 400 mm seat. Selection arithmetic: C 2120 kN against C0 4000 kN gives a C0/C ratio of 1.89, and the 290 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 106 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (66.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 2120/4000 kN ratings belong to this exact execution (C 3980 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 3980 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 400 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 2120/4000 kN ratings and 66500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3980 KM mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 400 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3980 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3980 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "23980", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (400×540×106 mm) SKF spherical roller bearing SKF 23980 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23980 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23980-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (400×540×106 mm) SKF spherical roller bearing SKF 23980 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23980 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3980-KM", "C 3980 KM" ], "locale_variants": {} }, { "sku": "C3080-M", "brand": "SKF", "manufacturer_designation": "C 3080 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 400, "D_mm": 600, "B_mm": 148, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3650, "static_load_kN": 6200, "fatigue_load_limit_kN": 450, "reference_speed_rpm": 800, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 145000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 3080 M in the dimension series 30 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 3080 M the 30 dimension series fixes the 600 mm OD and 148 mm width around the 400 mm bore (code 80 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 400 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 148 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 600 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (145 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3080 M must float; the two are designed to be used as a pair.", "The quoted 3650/6200 kN ratings belong to this exact execution (C 3080 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 3080 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 3650/6200 kN ratings and 145000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3080 M?", "a": "A C 3080 M measures 400 mm bore × 600 mm outside diameter × 148 mm width (15.748 × 23.622 × 5.827 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3650 kN, static C0 6200 kN, fatigue limit Pu 450 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 145000 g." }, { "q": "Can a CARB bearing like C 3080 M locate the shaft axially?", "a": "No — that is the defining feature. C 3080 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3080 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 80 = 400 mm bore (code 80 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (3650 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3080 M is the cylindrical bore for direct shaft fitting, machined brass M cage." } ], "cross_ref": [ { "equiv_sku": "C3080-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 400×600×148 mm ISO 15 envelope and equivalent catalogue C/C0; C 3080 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3080-M", "C 3080 M" ], "locale_variants": {} }, { "sku": "C3080-KM", "brand": "SKF", "manufacturer_designation": "C 3080 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 400, "D_mm": 600, "B_mm": 148, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3650, "static_load_kN": 6200, "fatigue_load_limit_kN": 450, "reference_speed_rpm": 800, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 145000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3080 KM combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 400 mm bore, 600 mm outside diameter, 148 mm wide unit rated 3650 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 3080 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 400 mm shaft deflects; the 800 r/min reference and 1,100 r/min limiting speed are both catalogue values. Speed planning separates the 800 r/min thermal reference from the 1,100 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (145 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3080 KM must float; the two are designed to be used as a pair.", "Never use C 3080 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 400 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 3650/6200 kN ratings and 145000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3080 KM mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 400 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3080 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3080 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C3080-M", "equiv_brand": "SKF", "level": "full", "note": "Same 400×600×148 mm ISO 15 envelope and equivalent catalogue C/C0; C 3080 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3080-KM", "C 3080 KM" ], "locale_variants": {} }, { "sku": "C3180-M", "brand": "SKF", "manufacturer_designation": "C 3180 M", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 400, "D_mm": 650, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4800, "static_load_kN": 8300, "fatigue_load_limit_kN": 585, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "max_rpm": 950, "weight_g": 258000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3180 M denotes a toroidal roller bearing whose 200 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 3180 M the 31 dimension series fixes the 650 mm OD and 200 mm width around the 400 mm bore (code 80 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 400 mm shaft deflects; the 700 r/min reference and 950 r/min limiting speed are both catalogue values. Selection arithmetic: C 4800 kN against C0 8300 kN gives a C0/C ratio of 1.73, and the 585 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (258 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 4800/8300 kN ratings belong to this exact execution (C 3180 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 3180 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 400 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 4800/8300 kN ratings and 258000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3180 M locate the shaft axially?", "a": "No — that is the defining feature. C 3180 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3180 M designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 80 = 400 mm bore (code 80 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (4800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3180 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 3180 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 400 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 200 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C3180-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 400×650×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 3180 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23180", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (400×650×200 mm) SKF spherical roller bearing SKF 23180 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23180 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23180-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (400×650×200 mm) SKF spherical roller bearing SKF 23180 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23180 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3180-M", "C 3180 M" ], "locale_variants": {} }, { "sku": "C3180-KM", "brand": "SKF", "manufacturer_designation": "C 3180 KM", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 400, "D_mm": 650, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4800, "static_load_kN": 8300, "fatigue_load_limit_kN": 585, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "max_rpm": 950, "weight_g": 258000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3180 KM is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 400 mm bore, 650 mm OD, 200 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 3180 KM the 31 dimension series fixes the 650 mm OD and 200 mm width around the 400 mm bore (code 80 × 5); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The K suffix gives a 1:12 tapered 400 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 400×650×200 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3180 KM deliberately carries none. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 200 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (258 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 4800/8300 kN ratings belong to this exact execution (C 3180 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3180 KM must float; the two are designed to be used as a pair.", "Never use C 3180 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 4800/8300 kN ratings and 258000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (4800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3180 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." }, { "q": "How is C 3180 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3180 KM?", "a": "A C 3180 KM measures 400 mm bore × 650 mm outside diameter × 200 mm width (15.748 × 25.591 × 7.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4800 kN, static C0 8300 kN, fatigue limit Pu 585 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 258000 g." }, { "q": "Can a CARB bearing like C 3180 KM locate the shaft axially?", "a": "No — that is the defining feature. C 3180 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C3180-M", "equiv_brand": "SKF", "level": "full", "note": "Same 400×650×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 3180 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23180", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (400×650×200 mm) SKF spherical roller bearing SKF 23180 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23180 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23180-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (400×650×200 mm) SKF spherical roller bearing SKF 23180 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23180 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3180-KM", "C 3180 KM" ], "locale_variants": {} }, { "sku": "C3984-M", "brand": "SKF", "manufacturer_designation": "C 3984 M", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 420, "D_mm": 560, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2160, "static_load_kN": 4250, "fatigue_load_limit_kN": 310, "reference_speed_rpm": 850, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 72000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3984 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 420×560×106 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 3984 M the 39 dimension series fixes the 560 mm OD and 106 mm width around the 420 mm bore (code 84 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 420 mm shaft deflects; the 850 r/min reference and 1,200 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3984 M deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (72 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3984 M must float; the two are designed to be used as a pair.", "Never use C 3984 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 2160/4250 kN ratings and 72000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 3984 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 420 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 106 mm roller set." }, { "q": "What are the dimensions and ratings of the C 3984 M?", "a": "A C 3984 M measures 420 mm bore × 560 mm outside diameter × 106 mm width (16.535 × 22.047 × 4.173 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2160 kN, static C0 4250 kN, fatigue limit Pu 310 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 72000 g." }, { "q": "Can a CARB bearing like C 3984 M locate the shaft axially?", "a": "No — that is the defining feature. C 3984 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3984 M designation read?", "a": "C = CARB toroidal family; 39 = dimension series; 84 = 420 mm bore (code 84 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C3984-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 420×560×106 mm ISO 15 envelope and equivalent catalogue C/C0; C 3984 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23984", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (420×560×106 mm) SKF spherical roller bearing SKF 23984 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23984 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23984-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (420×560×106 mm) SKF spherical roller bearing SKF 23984 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23984 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3984-M", "C 3984 M" ], "locale_variants": {} }, { "sku": "C3984-KM", "brand": "SKF", "manufacturer_designation": "C 3984 KM", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 420, "D_mm": 560, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2160, "static_load_kN": 4250, "fatigue_load_limit_kN": 310, "reference_speed_rpm": 850, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 72000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3984 KM denotes a toroidal roller bearing whose 106 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (84) encode the 420 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 420 mm shaft deflects; the 850 r/min reference and 1,200 r/min limiting speed are both catalogue values. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 106 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 560 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (72 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 2160/4250 kN ratings belong to this exact execution (C 3984 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 850 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 2160/4250 kN ratings and 72000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3984 KM mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 420 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3984 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3984 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C3984-M", "equiv_brand": "SKF", "level": "full", "note": "Same 420×560×106 mm ISO 15 envelope and equivalent catalogue C/C0; C 3984 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23984", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (420×560×106 mm) SKF spherical roller bearing SKF 23984 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23984 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23984-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (420×560×106 mm) SKF spherical roller bearing SKF 23984 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23984 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3984-KM", "C 3984 KM" ], "locale_variants": {} }, { "sku": "C3084-M", "brand": "SKF", "manufacturer_designation": "C 3084 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 420, "D_mm": 620, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3800, "static_load_kN": 6400, "fatigue_load_limit_kN": 455, "reference_speed_rpm": 800, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 150000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3084 M: the toroidal rollers allow the 420 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 3084 M separates into C (CARB), 30 (dimension series), 84 (420 mm bore) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 420×620×150 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 420 mm seat. Speed planning separates the 800 r/min thermal reference from the 1,100 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (150 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3084 M must float; the two are designed to be used as a pair.", "Never use C 3084 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 3800/6400 kN ratings and 150000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3084 M locate the shaft axially?", "a": "No — that is the defining feature. C 3084 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3084 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 84 = 420 mm bore (code 84 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (3800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3084 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 3084 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 420 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 150 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C3084-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 420×620×150 mm ISO 15 envelope and equivalent catalogue C/C0; C 3084 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3084-M", "C 3084 M" ], "locale_variants": {} }, { "sku": "C3084-KM", "brand": "SKF", "manufacturer_designation": "C 3084 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 420, "D_mm": 620, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3800, "static_load_kN": 6400, "fatigue_load_limit_kN": 455, "reference_speed_rpm": 800, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 150000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3084 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 420×620×150 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (84) encode the 420 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 420 mm shaft deflects; the 800 r/min reference and 1,100 r/min limiting speed are both catalogue values. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 150 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 620 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (150 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3084 KM must float; the two are designed to be used as a pair.", "Never use C 3084 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 3800/6400 kN ratings and 150000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 3084 KM have?", "a": "A C 3084 KM measures 420 mm bore × 620 mm outside diameter × 150 mm width (16.535 × 24.409 × 5.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3800 kN, static C0 6400 kN, fatigue limit Pu 455 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 150000 g." }, { "q": "What does C 3084 KM mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 420 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3084 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3084 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C3084-M", "equiv_brand": "SKF", "level": "full", "note": "Same 420×620×150 mm ISO 15 envelope and equivalent catalogue C/C0; C 3084 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3084-KM", "C 3084 KM" ], "locale_variants": {} }, { "sku": "C3184-M", "brand": "SKF", "manufacturer_designation": "C 3184 M", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 420, "D_mm": 700, "B_mm": 224, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6000, "static_load_kN": 10400, "fatigue_load_limit_kN": 720, "reference_speed_rpm": 670, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 355000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3184 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 420×700×224 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 3184 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 420 mm shaft deflects; the 670 r/min reference and 900 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3184 M deliberately carries none. Mounting: slide the bearing onto the 420 mm seat or heat it (max 120 °C) and seat it square; never press through the 224 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (355 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 6000/10400 kN ratings belong to this exact execution (C 3184 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 3184 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 6000/10400 kN ratings and 355000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 3184 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3184 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3184 M have?", "a": "A C 3184 M measures 420 mm bore × 700 mm outside diameter × 224 mm width (16.535 × 27.559 × 8.819 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6000 kN, static C0 10400 kN, fatigue limit Pu 720 kN, reference speed 670 r/min, limiting speed 900 r/min, mass about 355000 g." } ], "cross_ref": [ { "equiv_sku": "C3184-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 420×700×224 mm ISO 15 envelope and equivalent catalogue C/C0; C 3184 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23184", "equiv_brand": "SKF", "level": "partial", "note": "Same 420×700×224 mm envelope as the SKF spherical roller bearing SKF 23184 CJ/W33, but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23184-CKJ-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 420×700×224 mm envelope as the SKF spherical roller bearing SKF 23184 CKJ/W33, but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3184-M", "C 3184 M" ], "locale_variants": {} }, { "sku": "C3184-KM", "brand": "SKF", "manufacturer_designation": "C 3184 KM", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 420, "D_mm": 700, "B_mm": 224, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6000, "static_load_kN": 10400, "fatigue_load_limit_kN": 720, "reference_speed_rpm": 670, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 355000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3184 KM belongs to the CARB family — compact aligning roller bearings: envelope 420×700×224 mm, radial rating 6000/10400 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (84) encode the 420 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 420 mm seat. Speed planning separates the 670 r/min thermal reference from the 900 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 700 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (355 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 670 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 6000/10400 kN ratings belong to this exact execution (C 3184 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 6000/10400 kN ratings and 355000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 3184 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3184 KM have?", "a": "A C 3184 KM measures 420 mm bore × 700 mm outside diameter × 224 mm width (16.535 × 27.559 × 8.819 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6000 kN, static C0 10400 kN, fatigue limit Pu 720 kN, reference speed 670 r/min, limiting speed 900 r/min, mass about 355000 g." }, { "q": "What does C 3184 KM mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 420 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C3184-M", "equiv_brand": "SKF", "level": "full", "note": "Same 420×700×224 mm ISO 15 envelope and equivalent catalogue C/C0; C 3184 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23184", "equiv_brand": "SKF", "level": "partial", "note": "Same 420×700×224 mm envelope as the SKF spherical roller bearing SKF 23184 CJ/W33, but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23184-CKJ-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 420×700×224 mm envelope as the SKF spherical roller bearing SKF 23184 CKJ/W33, but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3184-KM", "C 3184 KM" ], "locale_variants": {} }, { "sku": "C3088-MB", "brand": "SKF", "manufacturer_designation": "C 3088 MB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 440, "D_mm": 650, "B_mm": 157, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3750, "static_load_kN": 6400, "fatigue_load_limit_kN": 450, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 190000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3088 MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 440 mm bore, 650 mm outside diameter, 157 mm wide unit rated 3750 kN dynamic. In C 3088 MB the 30 dimension series fixes the 650 mm OD and 157 mm width around the 440 mm bore (code 88 × 5); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The cylindrical 440 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 440×650×157 mm are identical — only the mounting method changes. The 190000 g mass over the 440×650×157 mm envelope yields about 8.52 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (190 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 3088 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 440 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3088 MB must float; the two are designed to be used as a pair.", "The 3750/6400 kN ratings and 190000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3088 MB?", "a": "A C 3088 MB measures 440 mm bore × 650 mm outside diameter × 157 mm width (17.323 × 25.591 × 6.181 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3750 kN, static C0 6400 kN, fatigue limit Pu 450 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 190000 g." }, { "q": "Can a CARB bearing like C 3088 MB locate the shaft axially?", "a": "No — that is the defining feature. C 3088 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3088 MB designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 88 = 440 mm bore (code 88 × 5); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (3750 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3088 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." } ], "cross_ref": [ { "equiv_sku": "C3088-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 440×650×157 mm ISO 15 envelope and equivalent catalogue C/C0; C 3088 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3088-MB", "C 3088 MB" ], "locale_variants": {} }, { "sku": "C3088-KMB", "brand": "SKF", "manufacturer_designation": "C 3088 KMB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 440, "D_mm": 650, "B_mm": 157, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3750, "static_load_kN": 6400, "fatigue_load_limit_kN": 450, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 190000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3088 KMB belongs to the CARB family — compact aligning roller bearings: envelope 440×650×157 mm, radial rating 3750/6400 kN C/C0, and no axial-locating function by design. In C 3088 KMB the 30 dimension series fixes the 650 mm OD and 157 mm width around the 440 mm bore (code 88 × 5); the suffix KMB then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 440 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 157 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 157 mm wide cavity does not fill itself.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (190 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 3088 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 440 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 750 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 3750/6400 kN ratings belong to this exact execution (C 3088 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 3750/6400 kN ratings and 190000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (3750 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3088 KMB is the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 3088 KMB mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3088 KMB?", "a": "A C 3088 KMB measures 440 mm bore × 650 mm outside diameter × 157 mm width (17.323 × 25.591 × 6.181 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3750 kN, static C0 6400 kN, fatigue limit Pu 450 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 190000 g." }, { "q": "Can a CARB bearing like C 3088 KMB locate the shaft axially?", "a": "No — that is the defining feature. C 3088 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C3088-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 440×650×157 mm ISO 15 envelope and equivalent catalogue C/C0; C 3088 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3088-KMB", "C 3088 KMB" ], "locale_variants": {} }, { "sku": "C3188-MB", "brand": "SKF", "manufacturer_designation": "C 3188 MB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 440, "D_mm": 720, "B_mm": 226, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6700, "static_load_kN": 11400, "fatigue_load_limit_kN": 780, "reference_speed_rpm": 630, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 385000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3188 MB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 440 mm bore, 720 mm OD, 226 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 3188 MB the 31 dimension series fixes the 720 mm OD and 226 mm width around the 440 mm bore (code 88 × 5); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 440 mm shaft deflects; the 630 r/min reference and 850 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3188 MB deliberately carries none. Mounting: slide the bearing onto the 440 mm seat or heat it (max 120 °C) and seat it square; never press through the 226 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (385 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 630 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 6700/11400 kN ratings belong to this exact execution (C 3188 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3188 MB must float; the two are designed to be used as a pair.", "Never use C 3188 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 6700/11400 kN ratings and 385000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 3188 MB designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 88 = 440 mm bore (code 88 × 5); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (6700 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3188 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 3188 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 440 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 226 mm roller set." }, { "q": "What are the dimensions and ratings of the C 3188 MB?", "a": "A C 3188 MB measures 440 mm bore × 720 mm outside diameter × 226 mm width (17.323 × 28.346 × 8.898 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6700 kN, static C0 11400 kN, fatigue limit Pu 780 kN, reference speed 630 r/min, limiting speed 850 r/min, mass about 385000 g." } ], "cross_ref": [ { "equiv_sku": "C3188-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 440×720×226 mm ISO 15 envelope and equivalent catalogue C/C0; C 3188 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23188", "equiv_brand": "SKF", "level": "partial", "note": "Same 440×720×226 mm envelope as the SKF spherical roller bearing SKF 23188 CA/W33, but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23188-CAK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 440×720×226 mm envelope as the SKF spherical roller bearing SKF 23188 CAK/W33, but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3188-MB", "C 3188 MB" ], "locale_variants": {} }, { "sku": "C3188-KMB", "brand": "SKF", "manufacturer_designation": "C 3188 KMB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 440, "D_mm": 720, "B_mm": 226, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6700, "static_load_kN": 11400, "fatigue_load_limit_kN": 780, "reference_speed_rpm": 630, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 385000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3188 KMB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 440 mm bore, 720 mm OD, 226 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 3188 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KMB. The K suffix gives a 1:12 tapered 440 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 440×720×226 mm are identical — only the mounting method changes. The 385000 g mass over the 440×720×226 mm envelope yields about 15.23 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 720 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (385 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3188 KMB must float; the two are designed to be used as a pair.", "Never use C 3188 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 6700/11400 kN ratings belong to this exact execution (C 3188 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 6700/11400 kN ratings and 385000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 3188 KMB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3188 KMB have?", "a": "A C 3188 KMB measures 440 mm bore × 720 mm outside diameter × 226 mm width (17.323 × 28.346 × 8.898 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6700 kN, static C0 11400 kN, fatigue limit Pu 780 kN, reference speed 630 r/min, limiting speed 850 r/min, mass about 385000 g." }, { "q": "What does C 3188 KMB mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 440 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C3188-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 440×720×226 mm ISO 15 envelope and equivalent catalogue C/C0; C 3188 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23188", "equiv_brand": "SKF", "level": "partial", "note": "Same 440×720×226 mm envelope as the SKF spherical roller bearing SKF 23188 CA/W33, but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23188-CAK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 440×720×226 mm envelope as the SKF spherical roller bearing SKF 23188 CAK/W33, but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3188-KMB", "C 3188 KMB" ], "locale_variants": {} }, { "sku": "C4188-MB", "brand": "SKF", "manufacturer_designation": "C 4188 MB", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 440, "D_mm": 720, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 7500, "static_load_kN": 12900, "fatigue_load_limit_kN": 900, "reference_speed_rpm": 500, "limiting_speed_rpm": 670, "max_rpm": 670, "weight_g": 471000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 4188 MB in the dimension series 41 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 4188 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 440 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 280 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 280 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (471 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 440 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 4188 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 7500/12900 kN ratings belong to this exact execution (C 4188 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 7500/12900 kN ratings and 471000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 4188 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4188 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4188 MB have?", "a": "A C 4188 MB measures 440 mm bore × 720 mm outside diameter × 280 mm width (17.323 × 28.346 × 11.024 in). From SKF catalogue PUB BU/P1 17000: dynamic C 7500 kN, static C0 12900 kN, fatigue limit Pu 900 kN, reference speed 500 r/min, limiting speed 670 r/min, mass about 471000 g." } ], "cross_ref": [ { "equiv_sku": "C4188-K30MB", "equiv_brand": "SKF", "level": "full", "note": "Same 440×720×280 mm ISO 15 envelope and equivalent catalogue C/C0; C 4188 K30MB is the 1:30 tapered-bore K30 MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24188", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (440×720×280 mm) SKF spherical roller bearing SKF 24188 ECA/W33 with ratings within 10 % — not a drop-in substitute: SKF 24188 ECA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24188-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (440×720×280 mm) SKF spherical roller bearing SKF 24188 ECAK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24188 ECAK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4188-MB", "C 4188 MB" ], "locale_variants": {} }, { "sku": "C4188-K30MB", "brand": "SKF", "manufacturer_designation": "C 4188 K30MB", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 440, "D_mm": 720, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 7500, "static_load_kN": 12900, "fatigue_load_limit_kN": 900, "reference_speed_rpm": 500, "limiting_speed_rpm": 670, "max_rpm": 670, "weight_g": 471000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 4188 K30MB in the dimension series 41 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (41) identify the ISO dimension series and the last two (88) encode the 440 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 440 mm seat. Selection arithmetic: C 7500 kN against C0 12900 kN gives a C0/C ratio of 1.72, and the 900 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 720 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (471 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 7500/12900 kN ratings belong to this exact execution (C 4188 K30MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 440 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 7500/12900 kN ratings and 471000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 4188 K30MB have?", "a": "A C 4188 K30MB measures 440 mm bore × 720 mm outside diameter × 280 mm width (17.323 × 28.346 × 11.024 in). From SKF catalogue PUB BU/P1 17000: dynamic C 7500 kN, static C0 12900 kN, fatigue limit Pu 900 kN, reference speed 500 r/min, limiting speed 670 r/min, mass about 471000 g." }, { "q": "What does C 4188 K30MB mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 440 mm bore; K30MB is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4188 K30MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 4188 K30MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C4188-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 440×720×280 mm ISO 15 envelope and equivalent catalogue C/C0; C 4188 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24188", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (440×720×280 mm) SKF spherical roller bearing SKF 24188 ECA/W33 with ratings within 10 % — not a drop-in substitute: SKF 24188 ECA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24188-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (440×720×280 mm) SKF spherical roller bearing SKF 24188 ECAK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24188 ECAK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4188-K30MB", "C 4188 K30MB" ], "locale_variants": {} }, { "sku": "C3092-M", "brand": "SKF", "manufacturer_designation": "C 3092 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 460, "D_mm": 680, "B_mm": 163, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4000, "static_load_kN": 7500, "fatigue_load_limit_kN": 520, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "max_rpm": 950, "weight_g": 205000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3092 M combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 460 mm bore, 680 mm outside diameter, 163 mm wide unit rated 4000 kN dynamic. In C 3092 M the 30 dimension series fixes the 680 mm OD and 163 mm width around the 460 mm bore (code 92 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The cylindrical 460 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 460×680×163 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 163 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 460 mm seat or heat it (max 120 °C) and seat it square; never press through the 163 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (205 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 4000/7500 kN ratings belong to this exact execution (C 3092 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Never use C 3092 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 4000/7500 kN ratings and 205000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 3092 M?", "a": "A C 3092 M measures 460 mm bore × 680 mm outside diameter × 163 mm width (18.11 × 26.772 × 6.417 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4000 kN, static C0 7500 kN, fatigue limit Pu 520 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 205000 g." }, { "q": "Can a CARB bearing like C 3092 M locate the shaft axially?", "a": "No — that is the defining feature. C 3092 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3092 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 92 = 460 mm bore (code 92 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (4000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3092 M is the cylindrical bore for direct shaft fitting, machined brass M cage." } ], "cross_ref": [ { "equiv_sku": "C3092-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 460×680×163 mm ISO 15 envelope and equivalent catalogue C/C0; C 3092 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3092-M", "C 3092 M" ], "locale_variants": {} }, { "sku": "C3092-KM", "brand": "SKF", "manufacturer_designation": "C 3092 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 460, "D_mm": 680, "B_mm": 163, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4000, "static_load_kN": 7500, "fatigue_load_limit_kN": 520, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "max_rpm": 950, "weight_g": 205000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 3092 KM combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 460 mm bore, 680 mm outside diameter, 163 mm wide unit rated 4000 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 3092 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 460 mm shaft deflects; the 700 r/min reference and 950 r/min limiting speed are both catalogue values. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 163 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 680 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (205 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3092 KM must float; the two are designed to be used as a pair.", "Never use C 3092 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 4000/7500 kN ratings and 205000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 3092 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3092 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3092 KM have?", "a": "A C 3092 KM measures 460 mm bore × 680 mm outside diameter × 163 mm width (18.11 × 26.772 × 6.417 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4000 kN, static C0 7500 kN, fatigue limit Pu 520 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 205000 g." } ], "cross_ref": [ { "equiv_sku": "C3092-M", "equiv_brand": "SKF", "level": "full", "note": "Same 460×680×163 mm ISO 15 envelope and equivalent catalogue C/C0; C 3092 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3092-KM", "C 3092 KM" ], "locale_variants": {} }, { "sku": "C3192-M", "brand": "SKF", "manufacturer_designation": "C 3192 M", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 460, "D_mm": 760, "B_mm": 240, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6800, "static_load_kN": 12000, "fatigue_load_limit_kN": 815, "reference_speed_rpm": 600, "limiting_speed_rpm": 800, "max_rpm": 800, "weight_g": 435000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3192 M belongs to the CARB family — compact aligning roller bearings: envelope 460×760×240 mm, radial rating 6800/12000 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (92) encode the 460 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 460 mm seat. Speed planning separates the 600 r/min thermal reference from the 800 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 240 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (435 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 3192 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 6800/12000 kN ratings belong to this exact execution (C 3192 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 6800/12000 kN ratings and 435000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3192 M mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 460 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3192 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3192 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C3192-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 460×760×240 mm ISO 15 envelope and equivalent catalogue C/C0; C 3192 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23192", "equiv_brand": "SKF", "level": "partial", "note": "Same 460×760×240 mm envelope as the SKF spherical roller bearing SKF 23192 CA/W33, but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23192-CAK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 460×760×240 mm envelope as the SKF spherical roller bearing SKF 23192 CAK/W33, but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3192-M", "C 3192 M" ], "locale_variants": {} }, { "sku": "C3192-KM", "brand": "SKF", "manufacturer_designation": "C 3192 KM", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 460, "D_mm": 760, "B_mm": 240, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6800, "static_load_kN": 12000, "fatigue_load_limit_kN": 815, "reference_speed_rpm": 600, "limiting_speed_rpm": 800, "max_rpm": 800, "weight_g": 435000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3192 KM is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 460 mm bore, 760 mm OD, 240 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 3192 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The K suffix gives a 1:12 tapered 460 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 460×760×240 mm are identical — only the mounting method changes. Selection arithmetic: C 6800 kN against C0 12000 kN gives a C0/C ratio of 1.76, and the 815 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (435 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 6800/12000 kN ratings belong to this exact execution (C 3192 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 3192 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 6800/12000 kN ratings and 435000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3192 KM have?", "a": "A C 3192 KM measures 460 mm bore × 760 mm outside diameter × 240 mm width (18.11 × 29.921 × 9.449 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6800 kN, static C0 12000 kN, fatigue limit Pu 815 kN, reference speed 600 r/min, limiting speed 800 r/min, mass about 435000 g." }, { "q": "What does C 3192 KM mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 460 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3192 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C3192-M", "equiv_brand": "SKF", "level": "full", "note": "Same 460×760×240 mm ISO 15 envelope and equivalent catalogue C/C0; C 3192 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23192", "equiv_brand": "SKF", "level": "partial", "note": "Same 460×760×240 mm envelope as the SKF spherical roller bearing SKF 23192 CA/W33, but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." }, { "equiv_sku": "23192-CAK-W33", "equiv_brand": "SKF", "level": "partial", "note": "Same 460×760×240 mm envelope as the SKF spherical roller bearing SKF 23192 CAK/W33, but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3192-KM", "C 3192 KM" ], "locale_variants": {} }, { "sku": "C4192-MB", "brand": "SKF", "manufacturer_designation": "C 4192 MB", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 460, "D_mm": 760, "B_mm": 300, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8650, "static_load_kN": 15000, "fatigue_load_limit_kN": 1020, "reference_speed_rpm": 480, "limiting_speed_rpm": 630, "max_rpm": 630, "weight_g": 571000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4192 MB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 460×760×300 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 4192 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. The MB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Selection arithmetic: C 8650 kN against C0 15000 kN gives a C0/C ratio of 1.73, and the 1020 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 300 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (571 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 8650/15000 kN ratings belong to this exact execution (C 4192 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 4192 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 8650/15000 kN ratings and 571000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4192 MB have?", "a": "A C 4192 MB measures 460 mm bore × 760 mm outside diameter × 300 mm width (18.11 × 29.921 × 11.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8650 kN, static C0 15000 kN, fatigue limit Pu 1020 kN, reference speed 480 r/min, limiting speed 630 r/min, mass about 571000 g." }, { "q": "What does C 4192 MB mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 460 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4192 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C4192-K30MB", "equiv_brand": "SKF", "level": "full", "note": "Same 460×760×300 mm ISO 15 envelope and equivalent catalogue C/C0; C 4192 K30MB is the 1:30 tapered-bore K30 MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24192", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (460×760×300 mm) SKF spherical roller bearing SKF 24192 ECA/W33 with ratings within 10 % — not a drop-in substitute: SKF 24192 ECA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24192-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (460×760×300 mm) SKF spherical roller bearing SKF 24192 ECAK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24192 ECAK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4192-MB", "C 4192 MB" ], "locale_variants": {} }, { "sku": "C4192-K30MB", "brand": "SKF", "manufacturer_designation": "C 4192 K30MB", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 460, "D_mm": 760, "B_mm": 300, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8650, "static_load_kN": 15000, "fatigue_load_limit_kN": 1020, "reference_speed_rpm": 480, "limiting_speed_rpm": 630, "max_rpm": 630, "weight_g": 571000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 4192 K30MB belongs to the CARB family — compact aligning roller bearings: envelope 460×760×300 mm, radial rating 8650/15000 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 4192 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30MB. The K30 suffix gives a 1:30 tapered 460 mm bore, mounted on a withdrawal (AH) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 460×760×300 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 300 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the withdrawal (AH) sleeve matched to the 1:30 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 300 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (571 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 480 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4192 K30MB must float; the two are designed to be used as a pair.", "Never use C 4192 K30MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 8650/15000 kN ratings and 571000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 4192 K30MB have?", "a": "A C 4192 K30MB measures 460 mm bore × 760 mm outside diameter × 300 mm width (18.11 × 29.921 × 11.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8650 kN, static C0 15000 kN, fatigue limit Pu 1020 kN, reference speed 480 r/min, limiting speed 630 r/min, mass about 571000 g." }, { "q": "What does C 4192 K30MB mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 460 mm bore; K30MB is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 4192 K30MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C4192-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 460×760×300 mm ISO 15 envelope and equivalent catalogue C/C0; C 4192 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "24192", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (460×760×300 mm) SKF spherical roller bearing SKF 24192 ECA/W33 with ratings within 10 % — not a drop-in substitute: SKF 24192 ECA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "24192-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (460×760×300 mm) SKF spherical roller bearing SKF 24192 ECAK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24192 ECAK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C4192-K30MB", "C 4192 K30MB" ], "locale_variants": {} }, { "sku": "C3292-MB", "brand": "SKF", "manufacturer_designation": "C 3292 MB", "series": "C3200-series", "type": "carb_toroidal", "d_mm": 460, "D_mm": 830, "B_mm": 296, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9300, "static_load_kN": 15000, "fatigue_load_limit_kN": 1000, "reference_speed_rpm": 530, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 735000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3292 MB belongs to the CARB family — compact aligning roller bearings: envelope 460×830×296 mm, radial rating 9300/15000 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (32) identify the ISO dimension series and the last two (92) encode the 460 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 460 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3292 MB deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (735 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 3292 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 9300/15000 kN ratings belong to this exact execution (C 3292 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 9300/15000 kN ratings and 735000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3292 MB mean in SKF part numbering?", "a": "C marks CARB; 32 the dimension series; the size code gives 460 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3292 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3292 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C3292-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 460×830×296 mm ISO 15 envelope and equivalent catalogue C/C0; C 3292 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23292", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (460×830×296 mm) SKF spherical roller bearing SKF 23292 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23292 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23292-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (460×830×296 mm) SKF spherical roller bearing SKF 23292 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23292 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3292-MB", "C 3292 MB" ], "locale_variants": {} }, { "sku": "C3292-KMB", "brand": "SKF", "manufacturer_designation": "C 3292 KMB", "series": "C3200-series", "type": "carb_toroidal", "d_mm": 460, "D_mm": 830, "B_mm": 296, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9300, "static_load_kN": 15000, "fatigue_load_limit_kN": 1000, "reference_speed_rpm": 530, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 735000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3292 KMB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 460×830×296 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 3292 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KMB. The K suffix gives a 1:12 tapered 460 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 460×830×296 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3292 KMB deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 296 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (735 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 9300/15000 kN ratings belong to this exact execution (C 3292 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 3292 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 9300/15000 kN ratings and 735000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 3292 KMB have?", "a": "A C 3292 KMB measures 460 mm bore × 830 mm outside diameter × 296 mm width (18.11 × 32.677 × 11.654 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9300 kN, static C0 15000 kN, fatigue limit Pu 1000 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 735000 g." }, { "q": "What does C 3292 KMB mean in SKF part numbering?", "a": "C marks CARB; 32 the dimension series; the size code gives 460 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3292 KMB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3292 KMB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C3292-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 460×830×296 mm ISO 15 envelope and equivalent catalogue C/C0; C 3292 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23292", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (460×830×296 mm) SKF spherical roller bearing SKF 23292 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23292 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23292-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (460×830×296 mm) SKF spherical roller bearing SKF 23292 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23292 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3292-KMB", "C 3292 KMB" ], "locale_variants": {} }, { "sku": "C3996-M", "brand": "SKF", "manufacturer_designation": "C 3996 M", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 480, "D_mm": 650, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3100, "static_load_kN": 6100, "fatigue_load_limit_kN": 425, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 120000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 3996 M in the dimension series 39 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (96) encode the 480 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 480 mm seat. Selection arithmetic: C 3100 kN against C0 6100 kN gives a C0/C ratio of 1.97, and the 425 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 128 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (120 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 3100/6100 kN ratings belong to this exact execution (C 3996 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3996 M must float; the two are designed to be used as a pair.", "Never use C 3996 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 3100/6100 kN ratings and 120000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 3996 M have?", "a": "A C 3996 M measures 480 mm bore × 650 mm outside diameter × 128 mm width (18.898 × 25.591 × 5.039 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3100 kN, static C0 6100 kN, fatigue limit Pu 425 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 120000 g." }, { "q": "What does C 3996 M mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 480 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3996 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "23996", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (480×650×128 mm) SKF spherical roller bearing SKF 23996 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23996 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23996-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (480×650×128 mm) SKF spherical roller bearing SKF 23996 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23996 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3996-M", "C 3996 M" ], "locale_variants": {} }, { "sku": "C3096-M", "brand": "SKF", "manufacturer_designation": "C 3096 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 480, "D_mm": 700, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4050, "static_load_kN": 7800, "fatigue_load_limit_kN": 530, "reference_speed_rpm": 670, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 215000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3096 M belongs to the CARB family — compact aligning roller bearings: envelope 480×700×165 mm, radial rating 4050/7800 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 3096 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 480 mm seat. The 215000 g mass over the 480×700×165 mm envelope yields about 8.44 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (215 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 4050/7800 kN ratings belong to this exact execution (C 3096 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Reference and limiting speeds are different limits: the 670 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 3096 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 4050/7800 kN ratings and 215000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 3096 M mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 480 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 3096 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 3096 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C3096-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 480×700×165 mm ISO 15 envelope and equivalent catalogue C/C0; C 3096 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3096-M", "C 3096 M" ], "locale_variants": {} }, { "sku": "C3096-KM", "brand": "SKF", "manufacturer_designation": "C 3096 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 480, "D_mm": 700, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4050, "static_load_kN": 7800, "fatigue_load_limit_kN": 530, "reference_speed_rpm": 670, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 215000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3096 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 480×700×165 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 3096 KM the 30 dimension series fixes the 700 mm OD and 165 mm width around the 480 mm bore (code 96 × 5); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 480 mm shaft deflects; the 670 r/min reference and 900 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3096 KM deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 165 mm wide cavity does not fill itself.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (215 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Never use C 3096 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 480 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 670 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 4050/7800 kN ratings belong to this exact execution (C 3096 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 4050/7800 kN ratings and 215000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 3096 KM locate the shaft axially?", "a": "No — that is the defining feature. C 3096 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 3096 KM designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 96 = 480 mm bore (code 96 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (4050 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3096 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." }, { "q": "How is C 3096 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." } ], "cross_ref": [ { "equiv_sku": "C3096-M", "equiv_brand": "SKF", "level": "full", "note": "Same 480×700×165 mm ISO 15 envelope and equivalent catalogue C/C0; C 3096 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3096-KM", "C 3096 KM" ], "locale_variants": {} }, { "sku": "C3196-MB", "brand": "SKF", "manufacturer_designation": "C 3196 MB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 480, "D_mm": 790, "B_mm": 248, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6950, "static_load_kN": 12500, "fatigue_load_limit_kN": 830, "reference_speed_rpm": 560, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 523000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3196 MB denotes a toroidal roller bearing whose 248 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 3196 MB separates into C (CARB), 31 (dimension series), 96 (480 mm bore) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 480×790×248 mm follows the ISO 15 plan. The cylindrical 480 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 480×790×248 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 248 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (523 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3196 MB must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the 560 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 6950/12500 kN ratings belong to this exact execution (C 3196 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 6950/12500 kN ratings and 523000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (6950 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3196 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 3196 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 480 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 248 mm roller set." }, { "q": "What are the dimensions and ratings of the C 3196 MB?", "a": "A C 3196 MB measures 480 mm bore × 790 mm outside diameter × 248 mm width (18.898 × 31.102 × 9.764 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6950 kN, static C0 12500 kN, fatigue limit Pu 830 kN, reference speed 560 r/min, limiting speed 750 r/min, mass about 523000 g." }, { "q": "Can a CARB bearing like C 3196 MB locate the shaft axially?", "a": "No — that is the defining feature. C 3196 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C3196-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 480×790×248 mm ISO 15 envelope and equivalent catalogue C/C0; C 3196 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23196", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (480×790×248 mm) SKF spherical roller bearing SKF 23196 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23196 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23196-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (480×790×248 mm) SKF spherical roller bearing SKF 23196 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23196 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3196-MB", "C 3196 MB" ], "locale_variants": {} }, { "sku": "C3196-KMB", "brand": "SKF", "manufacturer_designation": "C 3196 KMB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 480, "D_mm": 790, "B_mm": 248, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6950, "static_load_kN": 12500, "fatigue_load_limit_kN": 830, "reference_speed_rpm": 560, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 523000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 3196 KMB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 480 mm bore, 790 mm OD, 248 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 3196 KMB separates into C (CARB), 31 (dimension series), 96 (480 mm bore) and KMB (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)); envelope 480×790×248 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 480 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 480×790×248 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3196 KMB deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 248 mm wide cavity does not fill itself.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (523 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3196 KMB must float; the two are designed to be used as a pair.", "Never use C 3196 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 480 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 6950/12500 kN ratings and 523000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (6950 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3196 KMB is the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 3196 KMB mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 3196 KMB?", "a": "A C 3196 KMB measures 480 mm bore × 790 mm outside diameter × 248 mm width (18.898 × 31.102 × 9.764 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6950 kN, static C0 12500 kN, fatigue limit Pu 830 kN, reference speed 560 r/min, limiting speed 750 r/min, mass about 523000 g." }, { "q": "Can a CARB bearing like C 3196 KMB locate the shaft axially?", "a": "No — that is the defining feature. C 3196 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C3196-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 480×790×248 mm ISO 15 envelope and equivalent catalogue C/C0; C 3196 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." }, { "equiv_sku": "23196", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (480×790×248 mm) SKF spherical roller bearing SKF 23196 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23196 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." }, { "equiv_sku": "23196-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (480×790×248 mm) SKF spherical roller bearing SKF 23196 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23196 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C3196-KMB", "C 3196 KMB" ], "locale_variants": {} }, { "sku": "C39-500-M", "brand": "SKF", "manufacturer_designation": "C 39/500 M", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 500, "D_mm": 670, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3150, "static_load_kN": 6300, "fatigue_load_limit_kN": 430, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "max_rpm": 950, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 39/500 M denotes a toroidal roller bearing whose 128 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 39/500 M the 39 dimension series fixes the 670 mm OD and 128 mm width around the 500 mm bore (the bore is written directly after the slash (no bore code)); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 700 r/min thermal reference from the 950 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (125 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 3150/6300 kN ratings belong to this exact execution (C 39/500 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 39/500 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 3150/6300 kN ratings and 125000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 39/500 M?", "a": "A C 39/500 M measures 500 mm bore × 670 mm outside diameter × 128 mm width (19.685 × 26.378 × 5.039 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3150 kN, static C0 6300 kN, fatigue limit Pu 430 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 125000 g." }, { "q": "Can a CARB bearing like C 39/500 M locate the shaft axially?", "a": "No — that is the defining feature. C 39/500 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 39/500 M designation read?", "a": "C = CARB toroidal family; 39 = dimension series; 500 mm (slash-size) = 500 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (3150 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/500 M is the cylindrical bore for direct shaft fitting, machined brass M cage." } ], "cross_ref": [ { "equiv_sku": "C39-500-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 500×670×128 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/500 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-500-M", "C 39/500 M" ], "locale_variants": {} }, { "sku": "C39-500-KM", "brand": "SKF", "manufacturer_designation": "C 39/500 KM", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 500, "D_mm": 670, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3150, "static_load_kN": 6300, "fatigue_load_limit_kN": 430, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "max_rpm": 950, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 39/500 KM combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 500 mm bore, 670 mm outside diameter, 128 mm wide unit rated 3150 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (500 mm (slash-size)) encode the 500 mm bore; suffixes describe bore and execution. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 128 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 670 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (125 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 3150/6300 kN ratings belong to this exact execution (C 39/500 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 3150/6300 kN ratings and 125000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 39/500 KM have?", "a": "A C 39/500 KM measures 500 mm bore × 670 mm outside diameter × 128 mm width (19.685 × 26.378 × 5.039 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3150 kN, static C0 6300 kN, fatigue limit Pu 430 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 125000 g." }, { "q": "What does C 39/500 KM mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 500 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 39/500 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 39/500 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C39-500-M", "equiv_brand": "SKF", "level": "full", "note": "Same 500×670×128 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/500 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-500-KM", "C 39/500 KM" ], "locale_variants": {} }, { "sku": "C30-500-M", "brand": "SKF", "manufacturer_designation": "C 30/500 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 500, "D_mm": 720, "B_mm": 167, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4250, "static_load_kN": 8300, "fatigue_load_limit_kN": 560, "reference_speed_rpm": 630, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 225000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 30/500 M combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 500 mm bore, 720 mm outside diameter, 167 mm wide unit rated 4250 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 30/500 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 167 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 500 mm seat or heat it (max 120 °C) and seat it square; never press through the 167 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (225 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "The quoted 4250/8300 kN ratings belong to this exact execution (C 30/500 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/500 M must float; the two are designed to be used as a pair.", "Never use C 30/500 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 4250/8300 kN ratings and 225000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 30/500 M have?", "a": "A C 30/500 M measures 500 mm bore × 720 mm outside diameter × 167 mm width (19.685 × 28.346 × 6.575 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4250 kN, static C0 8300 kN, fatigue limit Pu 560 kN, reference speed 630 r/min, limiting speed 900 r/min, mass about 225000 g." }, { "q": "What does C 30/500 M mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 500 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 30/500 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 30/500 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-500-M", "C 30/500 M" ], "locale_variants": {} }, { "sku": "C31-500-M", "brand": "SKF", "manufacturer_designation": "C 31/500 M", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 500, "D_mm": 830, "B_mm": 264, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 7500, "static_load_kN": 12700, "fatigue_load_limit_kN": 850, "reference_speed_rpm": 530, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 560000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 31/500 M combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 500 mm bore, 830 mm outside diameter, 264 mm wide unit rated 7500 kN dynamic. The designation C 31/500 M separates into C (CARB), 31 (dimension series), 500 mm (slash-size) (500 mm bore — bore 500 mm is written directly after the slash) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 500×830×264 mm follows the ISO 15 plan. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. The 560000 g mass over the 500×830×264 mm envelope yields about 15.00 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (560 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 7500/12700 kN ratings belong to this exact execution (C 31/500 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 31/500 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 7500/12700 kN ratings and 560000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 31/500 M?", "a": "A C 31/500 M measures 500 mm bore × 830 mm outside diameter × 264 mm width (19.685 × 32.677 × 10.394 in). From SKF catalogue PUB BU/P1 17000: dynamic C 7500 kN, static C0 12700 kN, fatigue limit Pu 850 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 560000 g." }, { "q": "Can a CARB bearing like C 31/500 M locate the shaft axially?", "a": "No — that is the defining feature. C 31/500 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 31/500 M designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 500 mm (slash-size) = 500 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (7500 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/500 M is the cylindrical bore for direct shaft fitting, machined brass M cage." } ], "cross_ref": [ { "equiv_sku": "C31-500-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 500×830×264 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/500 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-500-M", "C 31/500 M" ], "locale_variants": {} }, { "sku": "C31-500-KM", "brand": "SKF", "manufacturer_designation": "C 31/500 KM", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 500, "D_mm": 830, "B_mm": 264, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 7500, "static_load_kN": 12700, "fatigue_load_limit_kN": 850, "reference_speed_rpm": 530, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 560000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 31/500 KM denotes a toroidal roller bearing whose 264 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 31/500 KM the 31 dimension series fixes the 830 mm OD and 264 mm width around the 500 mm bore (the bore is written directly after the slash (no bore code)); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 530 r/min thermal reference from the 750 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (560 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 7500/12700 kN ratings belong to this exact execution (C 31/500 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 31/500 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 7500/12700 kN ratings and 560000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 31/500 KM locate the shaft axially?", "a": "No — that is the defining feature. C 31/500 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 31/500 KM designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 500 mm (slash-size) = 500 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (7500 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/500 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." }, { "q": "How is C 31/500 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." } ], "cross_ref": [ { "equiv_sku": "C31-500-M", "equiv_brand": "SKF", "level": "full", "note": "Same 500×830×264 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/500 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-500-KM", "C 31/500 KM" ], "locale_variants": {} }, { "sku": "C41-500-M", "brand": "SKF", "manufacturer_designation": "C 41/500 M", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 500, "D_mm": 830, "B_mm": 325, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9800, "static_load_kN": 17600, "fatigue_load_limit_kN": 1160, "reference_speed_rpm": 430, "limiting_speed_rpm": 560, "max_rpm": 560, "weight_g": 710000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 41/500 M belongs to the CARB family — compact aligning roller bearings: envelope 500×830×325 mm, radial rating 9800/17600 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 41/500 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The cylindrical 500 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 500×830×325 mm are identical — only the mounting method changes. Speed planning separates the 430 r/min thermal reference from the 560 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 500 mm seat or heat it (max 120 °C) and seat it square; never press through the 325 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (710 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 41/500 M must float; the two are designed to be used as a pair.", "Never use C 41/500 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 9800/17600 kN ratings and 710000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 41/500 M have?", "a": "A C 41/500 M measures 500 mm bore × 830 mm outside diameter × 325 mm width (19.685 × 32.677 × 12.795 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9800 kN, static C0 17600 kN, fatigue limit Pu 1160 kN, reference speed 430 r/min, limiting speed 560 r/min, mass about 710000 g." }, { "q": "What does C 41/500 M mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 500 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 41/500 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 41/500 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C41-500-K30M", "equiv_brand": "SKF", "level": "full", "note": "Same 500×830×325 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/500 K30M is the 1:30 tapered-bore K30 M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C41-500-M", "C 41/500 M" ], "locale_variants": {} }, { "sku": "C41-500-K30M", "brand": "SKF", "manufacturer_designation": "C 41/500 K30M", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 500, "D_mm": 830, "B_mm": 325, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9800, "static_load_kN": 17600, "fatigue_load_limit_kN": 1160, "reference_speed_rpm": 430, "limiting_speed_rpm": 560, "max_rpm": 560, "weight_g": 710000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 41/500 K30M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 500×830×325 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 41/500 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30M. The K30M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 41/500 K30M deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 325 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "Above 200 mm bore these bearings weigh tens of kilograms (710 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 41/500 K30M must float; the two are designed to be used as a pair.", "The 9800/17600 kN ratings and 710000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 41/500 K30M mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 500 mm bore; K30M is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 41/500 K30M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 41/500 K30M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C41-500-M", "equiv_brand": "SKF", "level": "full", "note": "Same 500×830×325 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/500 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C41-500-K30M", "C 41/500 K30M" ], "locale_variants": {} }, { "sku": "C30-530-M", "brand": "SKF", "manufacturer_designation": "C 30/530 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 530, "D_mm": 780, "B_mm": 185, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5100, "static_load_kN": 9500, "fatigue_load_limit_kN": 630, "reference_speed_rpm": 600, "limiting_speed_rpm": 800, "max_rpm": 800, "weight_g": 300000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/530 M: the toroidal rollers allow the 530 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (530 mm (slash-size)) encode the 530 mm bore; suffixes describe bore and execution. The cylindrical 530 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 530×780×185 mm are identical — only the mounting method changes. Speed planning separates the 600 r/min thermal reference from the 800 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 780 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 530 mm bore the 300 kg mass and 185 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 530 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/530 M must float; the two are designed to be used as a pair.", "Never use C 30/530 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 5100/9500 kN ratings and 300000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 30/530 M have?", "a": "A C 30/530 M measures 530 mm bore × 780 mm outside diameter × 185 mm width (20.866 × 30.709 × 7.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5100 kN, static C0 9500 kN, fatigue limit Pu 630 kN, reference speed 600 r/min, limiting speed 800 r/min, mass about 300000 g." }, { "q": "What does C 30/530 M mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 530 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 30/530 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 30/530 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C30-530-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 530×780×185 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/530 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-530-M", "C 30/530 M" ], "locale_variants": {} }, { "sku": "C30-530-KM", "brand": "SKF", "manufacturer_designation": "C 30/530 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 530, "D_mm": 780, "B_mm": 185, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5100, "static_load_kN": 9500, "fatigue_load_limit_kN": 630, "reference_speed_rpm": 600, "limiting_speed_rpm": 800, "max_rpm": 800, "weight_g": 300000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/530 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 530×780×185 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (530 mm (slash-size)) encode the 530 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 530 mm seat. Selection arithmetic: C 5100 kN against C0 9500 kN gives a C0/C ratio of 1.86, and the 630 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 185 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 530 mm bore the 300 kg mass and 185 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/530 KM must float; the two are designed to be used as a pair.", "Never use C 30/530 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 530 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 5100/9500 kN ratings and 300000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 30/530 KM have?", "a": "A C 30/530 KM measures 530 mm bore × 780 mm outside diameter × 185 mm width (20.866 × 30.709 × 7.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5100 kN, static C0 9500 kN, fatigue limit Pu 630 kN, reference speed 600 r/min, limiting speed 800 r/min, mass about 300000 g." }, { "q": "What does C 30/530 KM mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 530 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 30/530 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C30-530-M", "equiv_brand": "SKF", "level": "full", "note": "Same 530×780×185 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/530 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-530-KM", "C 30/530 KM" ], "locale_variants": {} }, { "sku": "C31-530-M", "brand": "SKF", "manufacturer_designation": "C 31/530 M", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 530, "D_mm": 870, "B_mm": 272, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8800, "static_load_kN": 15600, "fatigue_load_limit_kN": 1020, "reference_speed_rpm": 500, "limiting_speed_rpm": 670, "max_rpm": 670, "weight_g": 636000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 31/530 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 530×870×272 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (530 mm (slash-size)) encode the 530 mm bore; suffixes describe bore and execution. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 530 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 500 r/min thermal reference from the 670 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 530 mm bore the 636 kg mass and 272 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 530 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 31/530 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 8800/15600 kN ratings belong to this exact execution (C 31/530 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 8800/15600 kN ratings and 636000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 31/530 M have?", "a": "A C 31/530 M measures 530 mm bore × 870 mm outside diameter × 272 mm width (20.866 × 34.252 × 10.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8800 kN, static C0 15600 kN, fatigue limit Pu 1020 kN, reference speed 500 r/min, limiting speed 670 r/min, mass about 636000 g." }, { "q": "What does C 31/530 M mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 530 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 31/530 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 31/530 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C31-530-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 530×870×272 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/530 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-530-M", "C 31/530 M" ], "locale_variants": {} }, { "sku": "C31-530-KM", "brand": "SKF", "manufacturer_designation": "C 31/530 KM", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 530, "D_mm": 870, "B_mm": 272, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8800, "static_load_kN": 15600, "fatigue_load_limit_kN": 1020, "reference_speed_rpm": 500, "limiting_speed_rpm": 670, "max_rpm": 670, "weight_g": 636000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 31/530 KM combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 530 mm bore, 870 mm outside diameter, 272 mm wide unit rated 8800 kN dynamic. The designation C 31/530 KM separates into C (CARB), 31 (dimension series), 530 mm (slash-size) (530 mm bore — bore 530 mm is written directly after the slash) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 530×870×272 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 530 mm shaft deflects; the 500 r/min reference and 670 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 31/530 KM deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 870 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 530 mm bore the 636 kg mass and 272 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/530 KM must float; the two are designed to be used as a pair.", "The quoted 8800/15600 kN ratings belong to this exact execution (C 31/530 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 31/530 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 8800/15600 kN ratings and 636000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 31/530 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 31/530 KM?", "a": "A C 31/530 KM measures 530 mm bore × 870 mm outside diameter × 272 mm width (20.866 × 34.252 × 10.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8800 kN, static C0 15600 kN, fatigue limit Pu 1020 kN, reference speed 500 r/min, limiting speed 670 r/min, mass about 636000 g." }, { "q": "Can a CARB bearing like C 31/530 KM locate the shaft axially?", "a": "No — that is the defining feature. C 31/530 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 31/530 KM designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 530 mm (slash-size) = 530 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C31-530-M", "equiv_brand": "SKF", "level": "full", "note": "Same 530×870×272 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/530 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-530-KM", "C 31/530 KM" ], "locale_variants": {} }, { "sku": "C39-560-M", "brand": "SKF", "manufacturer_designation": "C 39/560 M", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 560, "D_mm": 750, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3600, "static_load_kN": 7350, "fatigue_load_limit_kN": 490, "reference_speed_rpm": 600, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 175000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 39/560 M belongs to the CARB family — compact aligning roller bearings: envelope 560×750×140 mm, radial rating 3600/7350 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (560 mm (slash-size)) encode the 560 mm bore; suffixes describe bore and execution. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 560 mm and larger sizes needing robust guidance under heavy load. The 175000 g mass over the 560×750×140 mm envelope yields about 6.43 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 750 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 560 mm bore the 175 kg mass and 140 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/560 M must float; the two are designed to be used as a pair.", "Never use C 39/560 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 560 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 3600/7350 kN ratings and 175000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 39/560 M have?", "a": "A C 39/560 M measures 560 mm bore × 750 mm outside diameter × 140 mm width (22.047 × 29.528 × 5.512 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3600 kN, static C0 7350 kN, fatigue limit Pu 490 kN, reference speed 600 r/min, limiting speed 850 r/min, mass about 175000 g." }, { "q": "What does C 39/560 M mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 560 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 39/560 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C39-560-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 560×750×140 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/560 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-560-M", "C 39/560 M" ], "locale_variants": {} }, { "sku": "C39-560-KM", "brand": "SKF", "manufacturer_designation": "C 39/560 KM", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 560, "D_mm": 750, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3600, "static_load_kN": 7350, "fatigue_load_limit_kN": 490, "reference_speed_rpm": 600, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 175000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 39/560 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 560×750×140 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (560 mm (slash-size)) encode the 560 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 560 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 560×750×140 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 140 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 140 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 560 mm bore the 175 kg mass and 140 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/560 KM must float; the two are designed to be used as a pair.", "Never use C 39/560 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Reference and limiting speeds are different limits: the 600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 3600/7350 kN ratings belong to this exact execution (C 39/560 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 3600/7350 kN ratings and 175000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 39/560 KM have?", "a": "A C 39/560 KM measures 560 mm bore × 750 mm outside diameter × 140 mm width (22.047 × 29.528 × 5.512 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3600 kN, static C0 7350 kN, fatigue limit Pu 490 kN, reference speed 600 r/min, limiting speed 850 r/min, mass about 175000 g." }, { "q": "What does C 39/560 KM mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 560 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 39/560 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 39/560 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C39-560-M", "equiv_brand": "SKF", "level": "full", "note": "Same 560×750×140 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/560 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-560-KM", "C 39/560 KM" ], "locale_variants": {} }, { "sku": "C30-560-M", "brand": "SKF", "manufacturer_designation": "C 30/560 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 560, "D_mm": 820, "B_mm": 195, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5600, "static_load_kN": 11000, "fatigue_load_limit_kN": 720, "reference_speed_rpm": 530, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 350000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 30/560 M denotes a toroidal roller bearing whose 195 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 30/560 M the 30 dimension series fixes the 820 mm OD and 195 mm width around the 560 mm bore (the bore is written directly after the slash (no bore code)); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 560 mm and larger sizes needing robust guidance under heavy load. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/560 M deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 560 mm bore the 350 kg mass and 195 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 30/560 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 560 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/560 M must float; the two are designed to be used as a pair.", "The 5600/11000 kN ratings and 350000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 30/560 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 560 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 195 mm roller set." }, { "q": "What are the dimensions and ratings of the C 30/560 M?", "a": "A C 30/560 M measures 560 mm bore × 820 mm outside diameter × 195 mm width (22.047 × 32.283 × 7.677 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5600 kN, static C0 11000 kN, fatigue limit Pu 720 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 350000 g." }, { "q": "Can a CARB bearing like C 30/560 M locate the shaft axially?", "a": "No — that is the defining feature. C 30/560 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 30/560 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 560 mm (slash-size) = 560 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C30-560-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 560×820×195 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/560 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-560-M", "C 30/560 M" ], "locale_variants": {} }, { "sku": "C30-560-KM", "brand": "SKF", "manufacturer_designation": "C 30/560 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 560, "D_mm": 820, "B_mm": 195, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5600, "static_load_kN": 11000, "fatigue_load_limit_kN": 720, "reference_speed_rpm": 530, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 350000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/560 KM is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 560 mm bore, 820 mm OD, 195 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 30/560 KM separates into C (CARB), 30 (dimension series), 560 mm (slash-size) (560 mm bore — bore 560 mm is written directly after the slash) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 560×820×195 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 560 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 560×820×195 mm are identical — only the mounting method changes. The 350000 g mass over the 560×820×195 mm envelope yields about 10.00 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 195 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 560 mm bore the 350 kg mass and 195 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 30/560 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 560 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 5600/11000 kN ratings belong to this exact execution (C 30/560 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 5600/11000 kN ratings and 350000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 30/560 KM designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 560 mm (slash-size) = 560 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (5600 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/560 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." }, { "q": "How is C 30/560 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 30/560 KM?", "a": "A C 30/560 KM measures 560 mm bore × 820 mm outside diameter × 195 mm width (22.047 × 32.283 × 7.677 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5600 kN, static C0 11000 kN, fatigue limit Pu 720 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 350000 g." } ], "cross_ref": [ { "equiv_sku": "C30-560-M", "equiv_brand": "SKF", "level": "full", "note": "Same 560×820×195 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/560 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-560-KM", "C 30/560 KM" ], "locale_variants": {} }, { "sku": "C41-560-K30MB", "brand": "SKF", "manufacturer_designation": "C 41/560 K30MB", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 560, "D_mm": 920, "B_mm": 355, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 10400, "static_load_kN": 19600, "fatigue_load_limit_kN": 1270, "reference_speed_rpm": 380, "limiting_speed_rpm": 500, "max_rpm": 500, "weight_g": 989000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 41/560 K30MB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 560×920×355 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 41/560 K30MB the 41 dimension series fixes the 920 mm OD and 355 mm width around the 560 mm bore (the bore is written directly after the slash (no bore code)); the suffix K30MB then selects the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB). The K30MB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 355 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the withdrawal (AH) sleeve matched to the 1:30 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 355 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 560 mm bore the 989 kg mass and 355 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 41/560 K30MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 560 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 380 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 10400/19600 kN ratings belong to this exact execution (C 41/560 K30MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 10400/19600 kN ratings and 989000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 41/560 K30MB?", "a": "A C 41/560 K30MB measures 560 mm bore × 920 mm outside diameter × 355 mm width (22.047 × 36.22 × 13.976 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10400 kN, static C0 19600 kN, fatigue limit Pu 1270 kN, reference speed 380 r/min, limiting speed 500 r/min, mass about 989000 g." }, { "q": "Can a CARB bearing like C 41/560 K30MB locate the shaft axially?", "a": "No — that is the defining feature. C 41/560 K30MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 41/560 K30MB designation read?", "a": "C = CARB toroidal family; 41 = dimension series; 560 mm (slash-size) = 560 mm bore (the bore is written directly after the slash (no bore code)); suffix K30MB selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (10400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 41/560 K30MB is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)." } ], "cross_ref": [ { "equiv_sku": "C41", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C41-560-K30MB", "C 41/560 K30MB" ], "locale_variants": {} }, { "sku": "C30-600-M", "brand": "SKF", "manufacturer_designation": "C 30/600 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 600, "D_mm": 870, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6300, "static_load_kN": 12200, "fatigue_load_limit_kN": 780, "reference_speed_rpm": 500, "limiting_speed_rpm": 700, "max_rpm": 700, "weight_g": 395000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/600 M belongs to the CARB family — compact aligning roller bearings: envelope 600×870×200 mm, radial rating 6300/12200 kN C/C0, and no axial-locating function by design. In C 30/600 M the 30 dimension series fixes the 870 mm OD and 200 mm width around the 600 mm bore (the bore is written directly after the slash (no bore code)); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The cylindrical 600 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 600×870×200 mm are identical — only the mounting method changes. Speed planning separates the 500 r/min thermal reference from the 700 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 200 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 600 mm bore the 395 kg mass and 200 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 6300/12200 kN ratings belong to this exact execution (C 30/600 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/600 M must float; the two are designed to be used as a pair.", "The 6300/12200 kN ratings and 395000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 30/600 M locate the shaft axially?", "a": "No — that is the defining feature. C 30/600 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 30/600 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 600 mm (slash-size) = 600 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (6300 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/600 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 30/600 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 600 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 200 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C30-600-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 600×870×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/600 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-600-M", "C 30/600 M" ], "locale_variants": {} }, { "sku": "C30-600-KM", "brand": "SKF", "manufacturer_designation": "C 30/600 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 600, "D_mm": 870, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6300, "static_load_kN": 12200, "fatigue_load_limit_kN": 780, "reference_speed_rpm": 500, "limiting_speed_rpm": 700, "max_rpm": 700, "weight_g": 395000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/600 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 600×870×200 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 30/600 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The K suffix gives a 1:12 tapered 600 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 600×870×200 mm are identical — only the mounting method changes. Selection arithmetic: C 6300 kN against C0 12200 kN gives a C0/C ratio of 1.94, and the 780 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 200 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 600 mm bore the 395 kg mass and 200 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/600 KM must float; the two are designed to be used as a pair.", "Never use C 30/600 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 6300/12200 kN ratings belong to this exact execution (C 30/600 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 6300/12200 kN ratings and 395000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 30/600 KM have?", "a": "A C 30/600 KM measures 600 mm bore × 870 mm outside diameter × 200 mm width (23.622 × 34.252 × 7.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6300 kN, static C0 12200 kN, fatigue limit Pu 780 kN, reference speed 500 r/min, limiting speed 700 r/min, mass about 395000 g." }, { "q": "What does C 30/600 KM mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 600 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 30/600 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C30-600-M", "equiv_brand": "SKF", "level": "full", "note": "Same 600×870×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/600 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-600-KM", "C 30/600 KM" ], "locale_variants": {} }, { "sku": "C31-600-MB", "brand": "SKF", "manufacturer_designation": "C 31/600 MB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 600, "D_mm": 980, "B_mm": 300, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 10200, "static_load_kN": 18000, "fatigue_load_limit_kN": 1140, "reference_speed_rpm": 430, "limiting_speed_rpm": 600, "max_rpm": 600, "weight_g": 929000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 31/600 MB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 600 mm bore, 980 mm OD, 300 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 31/600 MB separates into C (CARB), 31 (dimension series), 600 mm (slash-size) (600 mm bore — bore 600 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 600×980×300 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 600 mm shaft deflects; the 430 r/min reference and 600 r/min limiting speed are both catalogue values. Speed planning separates the 430 r/min thermal reference from the 600 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 600 mm seat or heat it (max 120 °C) and seat it square; never press through the 300 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 600 mm bore the 929 kg mass and 300 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 31/600 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 600 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 10200/18000 kN ratings belong to this exact execution (C 31/600 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 10200/18000 kN ratings and 929000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 31/600 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 600 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 300 mm roller set." }, { "q": "What are the dimensions and ratings of the C 31/600 MB?", "a": "A C 31/600 MB measures 600 mm bore × 980 mm outside diameter × 300 mm width (23.622 × 38.583 × 11.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10200 kN, static C0 18000 kN, fatigue limit Pu 1140 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 929000 g." }, { "q": "Can a CARB bearing like C 31/600 MB locate the shaft axially?", "a": "No — that is the defining feature. C 31/600 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 31/600 MB designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 600 mm (slash-size) = 600 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C31-600-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 600×980×300 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/600 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-600-MB", "C 31/600 MB" ], "locale_variants": {} }, { "sku": "C31-600-KMB", "brand": "SKF", "manufacturer_designation": "C 31/600 KMB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 600, "D_mm": 980, "B_mm": 300, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 10200, "static_load_kN": 18000, "fatigue_load_limit_kN": 1140, "reference_speed_rpm": 430, "limiting_speed_rpm": 600, "max_rpm": 600, "weight_g": 929000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 31/600 KMB denotes a toroidal roller bearing whose 300 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 31/600 KMB the 31 dimension series fixes the 980 mm OD and 300 mm width around the 600 mm bore (the bore is written directly after the slash (no bore code)); the suffix KMB then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 600 mm shaft deflects; the 430 r/min reference and 600 r/min limiting speed are both catalogue values. The 929000 g mass over the 600×980×300 mm envelope yields about 17.00 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 600 mm bore the 929 kg mass and 300 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/600 KMB must float; the two are designed to be used as a pair.", "Never use C 31/600 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 600 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 10200/18000 kN ratings and 929000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 31/600 KMB mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 31/600 KMB?", "a": "A C 31/600 KMB measures 600 mm bore × 980 mm outside diameter × 300 mm width (23.622 × 38.583 × 11.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10200 kN, static C0 18000 kN, fatigue limit Pu 1140 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 929000 g." }, { "q": "Can a CARB bearing like C 31/600 KMB locate the shaft axially?", "a": "No — that is the defining feature. C 31/600 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 31/600 KMB designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 600 mm (slash-size) = 600 mm bore (the bore is written directly after the slash (no bore code)); suffix KMB selects tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C31-600-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 600×980×300 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/600 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-600-KMB", "C 31/600 KMB" ], "locale_variants": {} }, { "sku": "C41-600-MB", "brand": "SKF", "manufacturer_designation": "C 41/600 MB", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 600, "D_mm": 980, "B_mm": 375, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 12900, "static_load_kN": 23200, "fatigue_load_limit_kN": 1460, "reference_speed_rpm": 340, "limiting_speed_rpm": 450, "max_rpm": 450, "weight_g": 1150000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 41/600 MB is the dimension series 41 CARB toroidal roller bearings member of the CARB range: 600 mm bore, 980 mm OD, 375 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 41/600 MB separates into C (CARB), 41 (dimension series), 600 mm (slash-size) (600 mm bore — bore 600 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 600×980×375 mm follows the ISO 15 plan. The cylindrical 600 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 600×980×375 mm are identical — only the mounting method changes. The 1150000 g mass over the 600×980×375 mm envelope yields about 21.50 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 375 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 600 mm bore the 1150 kg mass and 375 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 340 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 12900/23200 kN ratings belong to this exact execution (C 41/600 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 41/600 MB must float; the two are designed to be used as a pair.", "The 12900/23200 kN ratings and 1150000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 41/600 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 600 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 375 mm roller set." }, { "q": "What are the dimensions and ratings of the C 41/600 MB?", "a": "A C 41/600 MB measures 600 mm bore × 980 mm outside diameter × 375 mm width (23.622 × 38.583 × 14.764 in). From SKF catalogue PUB BU/P1 17000: dynamic C 12900 kN, static C0 23200 kN, fatigue limit Pu 1460 kN, reference speed 340 r/min, limiting speed 450 r/min, mass about 1150000 g." }, { "q": "Can a CARB bearing like C 41/600 MB locate the shaft axially?", "a": "No — that is the defining feature. C 41/600 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 41/600 MB designation read?", "a": "C = CARB toroidal family; 41 = dimension series; 600 mm (slash-size) = 600 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C41-600-K30MB", "equiv_brand": "SKF", "level": "full", "note": "Same 600×980×375 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/600 K30MB is the 1:30 tapered-bore K30 MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C41-600-MB", "C 41/600 MB" ], "locale_variants": {} }, { "sku": "C41-600-K30MB", "brand": "SKF", "manufacturer_designation": "C 41/600 K30MB", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 600, "D_mm": 980, "B_mm": 375, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 12900, "static_load_kN": 23200, "fatigue_load_limit_kN": 1460, "reference_speed_rpm": 340, "limiting_speed_rpm": 450, "max_rpm": 450, "weight_g": 1150000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 41/600 K30MB denotes a toroidal roller bearing whose 375 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (41) identify the ISO dimension series and the last two (600 mm (slash-size)) encode the 600 mm bore; suffixes describe bore and execution. The K30 suffix gives a 1:30 tapered 600 mm bore, mounted on a withdrawal (AH) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 600×980×375 mm are identical — only the mounting method changes. Selection arithmetic: C 12900 kN against C0 23200 kN gives a C0/C ratio of 1.80, and the 1460 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 980 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 600 mm bore the 1150 kg mass and 375 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 600 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 340 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 41/600 K30MB must float; the two are designed to be used as a pair.", "Never use C 41/600 K30MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 12900/23200 kN ratings and 1150000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 41/600 K30MB mean in SKF part numbering?", "a": "C marks CARB; 41 the dimension series; the size code gives 600 mm bore; K30MB is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 41/600 K30MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 41/600 K30MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C41-600-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 600×980×375 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/600 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C41-600-K30MB", "C 41/600 K30MB" ], "locale_variants": {} }, { "sku": "C39-630-M", "brand": "SKF", "manufacturer_designation": "C 39/630 M", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 630, "D_mm": 850, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4650, "static_load_kN": 10000, "fatigue_load_limit_kN": 640, "reference_speed_rpm": 530, "limiting_speed_rpm": 700, "max_rpm": 700, "weight_g": 275000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 39/630 M in the dimension series 39 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 39/630 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 630 mm seat. The 275000 g mass over the 630×850×165 mm envelope yields about 7.38 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 850 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 630 mm bore the 275 kg mass and 165 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/630 M must float; the two are designed to be used as a pair.", "Never use C 39/630 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 630 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 4650/10000 kN ratings and 275000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 39/630 M mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 630 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 39/630 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 39/630 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C39-630-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 630×850×165 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/630 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-630-M", "C 39/630 M" ], "locale_variants": {} }, { "sku": "C39-630-KM", "brand": "SKF", "manufacturer_designation": "C 39/630 KM", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 630, "D_mm": 850, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4650, "static_load_kN": 10000, "fatigue_load_limit_kN": 640, "reference_speed_rpm": 530, "limiting_speed_rpm": 700, "max_rpm": 700, "weight_g": 275000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 39/630 KM: the toroidal rollers allow the 630 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 39/630 KM the 39 dimension series fixes the 850 mm OD and 165 mm width around the 630 mm bore (the bore is written directly after the slash (no bore code)); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The K suffix gives a 1:12 tapered 630 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 630×850×165 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 39/630 KM deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 850 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 630 mm bore the 275 kg mass and 165 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 39/630 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 630 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 4650/10000 kN ratings belong to this exact execution (C 39/630 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 4650/10000 kN ratings and 275000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 39/630 KM?", "a": "A C 39/630 KM measures 630 mm bore × 850 mm outside diameter × 165 mm width (24.803 × 33.465 × 6.496 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4650 kN, static C0 10000 kN, fatigue limit Pu 640 kN, reference speed 530 r/min, limiting speed 700 r/min, mass about 275000 g." }, { "q": "Can a CARB bearing like C 39/630 KM locate the shaft axially?", "a": "No — that is the defining feature. C 39/630 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 39/630 KM designation read?", "a": "C = CARB toroidal family; 39 = dimension series; 630 mm (slash-size) = 630 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (4650 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/630 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." } ], "cross_ref": [ { "equiv_sku": "C39-630-M", "equiv_brand": "SKF", "level": "full", "note": "Same 630×850×165 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/630 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-630-KM", "C 39/630 KM" ], "locale_variants": {} }, { "sku": "C30-630-M", "brand": "SKF", "manufacturer_designation": "C 30/630 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 630, "D_mm": 920, "B_mm": 212, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6800, "static_load_kN": 12900, "fatigue_load_limit_kN": 815, "reference_speed_rpm": 480, "limiting_speed_rpm": 670, "max_rpm": 670, "weight_g": 470000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/630 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 630×920×212 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 30/630 M separates into C (CARB), 30 (dimension series), 630 mm (slash-size) (630 mm bore — bore 630 mm is written directly after the slash) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 630×920×212 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 630 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/630 M deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 630 mm bore the 470 kg mass and 212 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 30/630 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 630 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/630 M must float; the two are designed to be used as a pair.", "The 6800/12900 kN ratings and 470000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 30/630 M locate the shaft axially?", "a": "No — that is the defining feature. C 30/630 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 30/630 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 630 mm (slash-size) = 630 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (6800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/630 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 30/630 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 630 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 212 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C30-630-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 630×920×212 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/630 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-630-M", "C 30/630 M" ], "locale_variants": {} }, { "sku": "C30-630-KM", "brand": "SKF", "manufacturer_designation": "C 30/630 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 630, "D_mm": 920, "B_mm": 212, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6800, "static_load_kN": 12900, "fatigue_load_limit_kN": 815, "reference_speed_rpm": 480, "limiting_speed_rpm": 670, "max_rpm": 670, "weight_g": 470000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/630 KM belongs to the CARB family — compact aligning roller bearings: envelope 630×920×212 mm, radial rating 6800/12900 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (630 mm (slash-size)) encode the 630 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 630 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 630×920×212 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 212 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 212 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 630 mm bore the 470 kg mass and 212 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 630 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 480 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 30/630 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 6800/12900 kN ratings belong to this exact execution (C 30/630 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 6800/12900 kN ratings and 470000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 30/630 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 30/630 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 30/630 KM have?", "a": "A C 30/630 KM measures 630 mm bore × 920 mm outside diameter × 212 mm width (24.803 × 36.22 × 8.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6800 kN, static C0 12900 kN, fatigue limit Pu 815 kN, reference speed 480 r/min, limiting speed 670 r/min, mass about 470000 g." } ], "cross_ref": [ { "equiv_sku": "C30-630-M", "equiv_brand": "SKF", "level": "full", "note": "Same 630×920×212 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/630 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-630-KM", "C 30/630 KM" ], "locale_variants": {} }, { "sku": "C31-630-MB", "brand": "SKF", "manufacturer_designation": "C 31/630 MB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 630, "D_mm": 1030, "B_mm": 315, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 11800, "static_load_kN": 20800, "fatigue_load_limit_kN": 1290, "reference_speed_rpm": 400, "limiting_speed_rpm": 560, "max_rpm": 560, "weight_g": 1090000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 31/630 MB: the toroidal rollers allow the 630 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 31/630 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. The cylindrical 630 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 630×1030×315 mm are identical — only the mounting method changes. The 1090000 g mass over the 630×1030×315 mm envelope yields about 18.73 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 630 mm seat or heat it (max 120 °C) and seat it square; never press through the 315 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 630 mm bore the 1090 kg mass and 315 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 630 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 11800/20800 kN ratings belong to this exact execution (C 31/630 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 11800/20800 kN ratings and 1090000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 31/630 MB mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 630 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 31/630 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 31/630 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C31-630-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 630×1030×315 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/630 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-630-MB", "C 31/630 MB" ], "locale_variants": {} }, { "sku": "C31-630-KMB", "brand": "SKF", "manufacturer_designation": "C 31/630 KMB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 630, "D_mm": 1030, "B_mm": 315, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 11800, "static_load_kN": 20800, "fatigue_load_limit_kN": 1290, "reference_speed_rpm": 400, "limiting_speed_rpm": 560, "max_rpm": 560, "weight_g": 1090000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 31/630 KMB in the dimension series 31 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (630 mm (slash-size)) encode the 630 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 630 mm seat. Selection arithmetic: C 11800 kN against C0 20800 kN gives a C0/C ratio of 1.76, and the 1290 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 315 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 630 mm bore the 1090 kg mass and 315 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/630 KMB must float; the two are designed to be used as a pair.", "Never use C 31/630 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Reference and limiting speeds are different limits: the 400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 11800/20800 kN ratings belong to this exact execution (C 31/630 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 11800/20800 kN ratings and 1090000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 31/630 KMB mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 630 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 31/630 KMB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 31/630 KMB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C31-630-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 630×1030×315 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/630 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-630-KMB", "C 31/630 KMB" ], "locale_variants": {} }, { "sku": "C30-670-M", "brand": "SKF", "manufacturer_designation": "C 30/670 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 670, "D_mm": 980, "B_mm": 230, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8150, "static_load_kN": 16300, "fatigue_load_limit_kN": 1000, "reference_speed_rpm": 430, "limiting_speed_rpm": 600, "max_rpm": 600, "weight_g": 590000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/670 M: the toroidal rollers allow the 670 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 30/670 M the 30 dimension series fixes the 980 mm OD and 230 mm width around the 670 mm bore (the bore is written directly after the slash (no bore code)); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 670 mm seat. Speed planning separates the 430 r/min thermal reference from the 600 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 980 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 670 mm bore the 590 kg mass and 230 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 30/670 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 670 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 8150/16300 kN ratings belong to this exact execution (C 30/670 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 8150/16300 kN ratings and 590000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 30/670 M?", "a": "A C 30/670 M measures 670 mm bore × 980 mm outside diameter × 230 mm width (26.378 × 38.583 × 9.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8150 kN, static C0 16300 kN, fatigue limit Pu 1000 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 590000 g." }, { "q": "Can a CARB bearing like C 30/670 M locate the shaft axially?", "a": "No — that is the defining feature. C 30/670 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 30/670 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 670 mm (slash-size) = 670 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (8150 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/670 M is the cylindrical bore for direct shaft fitting, machined brass M cage." } ], "cross_ref": [ { "equiv_sku": "C30-670-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 670×980×230 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/670 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-670-M", "C 30/670 M" ], "locale_variants": {} }, { "sku": "C30-670-KM", "brand": "SKF", "manufacturer_designation": "C 30/670 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 670, "D_mm": 980, "B_mm": 230, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8150, "static_load_kN": 16300, "fatigue_load_limit_kN": 1000, "reference_speed_rpm": 430, "limiting_speed_rpm": 600, "max_rpm": 600, "weight_g": 590000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/670 KM: the toroidal rollers allow the 670 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 30/670 KM the 30 dimension series fixes the 980 mm OD and 230 mm width around the 670 mm bore (the bore is written directly after the slash (no bore code)); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 670 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 230 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 980 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 670 mm bore the 590 kg mass and 230 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 8150/16300 kN ratings belong to this exact execution (C 30/670 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 670 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Never use C 30/670 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 8150/16300 kN ratings and 590000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 30/670 KM?", "a": "A C 30/670 KM measures 670 mm bore × 980 mm outside diameter × 230 mm width (26.378 × 38.583 × 9.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8150 kN, static C0 16300 kN, fatigue limit Pu 1000 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 590000 g." }, { "q": "Can a CARB bearing like C 30/670 KM locate the shaft axially?", "a": "No — that is the defining feature. C 30/670 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 30/670 KM designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 670 mm (slash-size) = 670 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (8150 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/670 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." } ], "cross_ref": [ { "equiv_sku": "C30-670-M", "equiv_brand": "SKF", "level": "full", "note": "Same 670×980×230 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/670 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-670-KM", "C 30/670 KM" ], "locale_variants": {} }, { "sku": "C31-670-MB", "brand": "SKF", "manufacturer_designation": "C 31/670 MB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 670, "D_mm": 1090, "B_mm": 336, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 11800, "static_load_kN": 21200, "fatigue_load_limit_kN": 1290, "reference_speed_rpm": 380, "limiting_speed_rpm": 500, "max_rpm": 500, "weight_g": 1300000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 31/670 MB belongs to the CARB family — compact aligning roller bearings: envelope 670×1090×336 mm, radial rating 11800/21200 kN C/C0, and no axial-locating function by design. The designation C 31/670 MB separates into C (CARB), 31 (dimension series), 670 mm (slash-size) (670 mm bore — bore 670 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 670×1090×336 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 670 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 336 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1090 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 670 mm bore the 1300 kg mass and 336 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 380 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 11800/21200 kN ratings belong to this exact execution (C 31/670 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/670 MB must float; the two are designed to be used as a pair.", "Never use C 31/670 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 11800/21200 kN ratings and 1300000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 31/670 MB?", "a": "A C 31/670 MB measures 670 mm bore × 1090 mm outside diameter × 336 mm width (26.378 × 42.913 × 13.228 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11800 kN, static C0 21200 kN, fatigue limit Pu 1290 kN, reference speed 380 r/min, limiting speed 500 r/min, mass about 1300000 g." }, { "q": "Can a CARB bearing like C 31/670 MB locate the shaft axially?", "a": "No — that is the defining feature. C 31/670 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 31/670 MB designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 670 mm (slash-size) = 670 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (11800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/670 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." } ], "cross_ref": [ { "equiv_sku": "C31-670-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 670×1090×336 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/670 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-670-MB", "C 31/670 MB" ], "locale_variants": {} }, { "sku": "C31-670-KMB", "brand": "SKF", "manufacturer_designation": "C 31/670 KMB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 670, "D_mm": 1090, "B_mm": 336, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 11800, "static_load_kN": 21200, "fatigue_load_limit_kN": 1290, "reference_speed_rpm": 380, "limiting_speed_rpm": 500, "max_rpm": 500, "weight_g": 1300000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 31/670 KMB: the toroidal rollers allow the 670 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 31/670 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KMB. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 670 mm seat. Speed planning separates the 380 r/min thermal reference from the 500 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1090 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 670 mm bore the 1300 kg mass and 336 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "The quoted 11800/21200 kN ratings belong to this exact execution (C 31/670 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 670 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 380 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 11800/21200 kN ratings and 1300000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 31/670 KMB have?", "a": "A C 31/670 KMB measures 670 mm bore × 1090 mm outside diameter × 336 mm width (26.378 × 42.913 × 13.228 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11800 kN, static C0 21200 kN, fatigue limit Pu 1290 kN, reference speed 380 r/min, limiting speed 500 r/min, mass about 1300000 g." }, { "q": "What does C 31/670 KMB mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 670 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 31/670 KMB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 31/670 KMB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C31-670-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 670×1090×336 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/670 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-670-KMB", "C 31/670 KMB" ], "locale_variants": {} }, { "sku": "C41-670-MB", "brand": "SKF", "manufacturer_designation": "C 41/670 MB", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 670, "D_mm": 1090, "B_mm": 412, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 16000, "static_load_kN": 29000, "fatigue_load_limit_kN": 1760, "reference_speed_rpm": 300, "limiting_speed_rpm": 400, "max_rpm": 400, "weight_g": 1570000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 41/670 MB is the dimension series 41 CARB toroidal roller bearings member of the CARB range: 670 mm bore, 1090 mm OD, 412 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 41/670 MB separates into C (CARB), 41 (dimension series), 670 mm (slash-size) (670 mm bore — bore 670 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 670×1090×412 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 670 mm shaft deflects; the 300 r/min reference and 400 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 41/670 MB deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 412 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 670 mm bore the 1570 kg mass and 412 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 41/670 MB must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the 300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 16000/29000 kN ratings belong to this exact execution (C 41/670 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 16000/29000 kN ratings and 1570000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 41/670 MB?", "a": "A C 41/670 MB measures 670 mm bore × 1090 mm outside diameter × 412 mm width (26.378 × 42.913 × 16.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 16000 kN, static C0 29000 kN, fatigue limit Pu 1760 kN, reference speed 300 r/min, limiting speed 400 r/min, mass about 1570000 g." }, { "q": "Can a CARB bearing like C 41/670 MB locate the shaft axially?", "a": "No — that is the defining feature. C 41/670 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 41/670 MB designation read?", "a": "C = CARB toroidal family; 41 = dimension series; 670 mm (slash-size) = 670 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (16000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 41/670 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." } ], "cross_ref": [ { "equiv_sku": "C41-670-K30MB", "equiv_brand": "SKF", "level": "full", "note": "Same 670×1090×412 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/670 K30MB is the 1:30 tapered-bore K30 MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C41-670-MB", "C 41/670 MB" ], "locale_variants": {} }, { "sku": "C41-670-K30MB", "brand": "SKF", "manufacturer_designation": "C 41/670 K30MB", "series": "C4100-series", "type": "carb_toroidal", "d_mm": 670, "D_mm": 1090, "B_mm": 412, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 16000, "static_load_kN": 29000, "fatigue_load_limit_kN": 1760, "reference_speed_rpm": 300, "limiting_speed_rpm": 400, "max_rpm": 400, "weight_g": 1570000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 41/670 K30MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 670 mm bore, 1090 mm outside diameter, 412 mm wide unit rated 16000 kN dynamic. The designation C 41/670 K30MB separates into C (CARB), 41 (dimension series), 670 mm (slash-size) (670 mm bore — bore 670 mm is written directly after the slash) and K30MB (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)); envelope 670×1090×412 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 670 mm shaft deflects; the 300 r/min reference and 400 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 41/670 K30MB deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1090 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 670 mm bore the 1570 kg mass and 412 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 16000/29000 kN ratings belong to this exact execution (C 41/670 K30MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Never use C 41/670 K30MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 16000/29000 kN ratings and 1570000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What are the dimensions and ratings of the C 41/670 K30MB?", "a": "A C 41/670 K30MB measures 670 mm bore × 1090 mm outside diameter × 412 mm width (26.378 × 42.913 × 16.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 16000 kN, static C0 29000 kN, fatigue limit Pu 1760 kN, reference speed 300 r/min, limiting speed 400 r/min, mass about 1570000 g." }, { "q": "Can a CARB bearing like C 41/670 K30MB locate the shaft axially?", "a": "No — that is the defining feature. C 41/670 K30MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 41/670 K30MB designation read?", "a": "C = CARB toroidal family; 41 = dimension series; 670 mm (slash-size) = 670 mm bore (the bore is written directly after the slash (no bore code)); suffix K30MB selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (16000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 41/670 K30MB is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)." } ], "cross_ref": [ { "equiv_sku": "C41-670-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 670×1090×412 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/670 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C41-670-K30MB", "C 41/670 K30MB" ], "locale_variants": {} }, { "sku": "C39-710-M", "brand": "SKF", "manufacturer_designation": "C 39/710 M", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 710, "D_mm": 950, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6000, "static_load_kN": 12500, "fatigue_load_limit_kN": 780, "reference_speed_rpm": 450, "limiting_speed_rpm": 630, "max_rpm": 630, "weight_g": 360000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 39/710 M: the toroidal rollers allow the 710 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (710 mm (slash-size)) encode the 710 mm bore; suffixes describe bore and execution. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 710 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 450 r/min thermal reference from the 630 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 180 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 710 mm bore the 360 kg mass and 180 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 450 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/710 M must float; the two are designed to be used as a pair.", "The 6000/12500 kN ratings and 360000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 39/710 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 39/710 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 39/710 M have?", "a": "A C 39/710 M measures 710 mm bore × 950 mm outside diameter × 180 mm width (27.953 × 37.402 × 7.087 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6000 kN, static C0 12500 kN, fatigue limit Pu 780 kN, reference speed 450 r/min, limiting speed 630 r/min, mass about 360000 g." } ], "cross_ref": [ { "equiv_sku": "C39-710-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 710×950×180 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/710 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-710-M", "C 39/710 M" ], "locale_variants": {} }, { "sku": "C39-710-KM", "brand": "SKF", "manufacturer_designation": "C 39/710 KM", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 710, "D_mm": 950, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6000, "static_load_kN": 12500, "fatigue_load_limit_kN": 780, "reference_speed_rpm": 450, "limiting_speed_rpm": 630, "max_rpm": 630, "weight_g": 360000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 39/710 KM: the toroidal rollers allow the 710 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 39/710 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The K suffix gives a 1:12 tapered 710 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 710×950×180 mm are identical — only the mounting method changes. Speed planning separates the 450 r/min thermal reference from the 630 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 180 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 710 mm bore the 360 kg mass and 180 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/710 KM must float; the two are designed to be used as a pair.", "Never use C 39/710 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 6000/12500 kN ratings and 360000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 39/710 KM have?", "a": "A C 39/710 KM measures 710 mm bore × 950 mm outside diameter × 180 mm width (27.953 × 37.402 × 7.087 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6000 kN, static C0 12500 kN, fatigue limit Pu 780 kN, reference speed 450 r/min, limiting speed 630 r/min, mass about 360000 g." }, { "q": "What does C 39/710 KM mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 710 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 39/710 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 39/710 KM sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C39-710-M", "equiv_brand": "SKF", "level": "full", "note": "Same 710×950×180 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/710 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-710-KM", "C 39/710 KM" ], "locale_variants": {} }, { "sku": "C30-710-M", "brand": "SKF", "manufacturer_designation": "C 30/710 M", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 710, "D_mm": 1030, "B_mm": 236, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8800, "static_load_kN": 17300, "fatigue_load_limit_kN": 1060, "reference_speed_rpm": 400, "limiting_speed_rpm": 560, "max_rpm": 560, "weight_g": 655000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/710 M belongs to the CARB family — compact aligning roller bearings: envelope 710×1030×236 mm, radial rating 8800/17300 kN C/C0, and no axial-locating function by design. In C 30/710 M the 30 dimension series fixes the 1030 mm OD and 236 mm width around the 710 mm bore (the bore is written directly after the slash (no bore code)); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 710 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 236 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1030 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 710 mm bore the 655 kg mass and 236 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 8800/17300 kN ratings belong to this exact execution (C 30/710 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Never use C 30/710 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 8800/17300 kN ratings and 655000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 30/710 M designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 710 mm (slash-size) = 710 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (8800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/710 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 30/710 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 710 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 236 mm roller set." }, { "q": "What are the dimensions and ratings of the C 30/710 M?", "a": "A C 30/710 M measures 710 mm bore × 1030 mm outside diameter × 236 mm width (27.953 × 40.551 × 9.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8800 kN, static C0 17300 kN, fatigue limit Pu 1060 kN, reference speed 400 r/min, limiting speed 560 r/min, mass about 655000 g." } ], "cross_ref": [ { "equiv_sku": "C30-710-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 710×1030×236 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/710 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-710-M", "C 30/710 M" ], "locale_variants": {} }, { "sku": "C30-710-KM", "brand": "SKF", "manufacturer_designation": "C 30/710 KM", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 710, "D_mm": 1030, "B_mm": 236, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8800, "static_load_kN": 17300, "fatigue_load_limit_kN": 1060, "reference_speed_rpm": 400, "limiting_speed_rpm": 560, "max_rpm": 560, "weight_g": 655000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/710 KM is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 710 mm bore, 1030 mm OD, 236 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 30/710 KM the 30 dimension series fixes the 1030 mm OD and 236 mm width around the 710 mm bore (the bore is written directly after the slash (no bore code)); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 710 mm and larger sizes needing robust guidance under heavy load. Selection arithmetic: C 8800 kN against C0 17300 kN gives a C0/C ratio of 1.97, and the 1060 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1030 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 710 mm bore the 655 kg mass and 236 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 30/710 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The quoted 8800/17300 kN ratings belong to this exact execution (C 30/710 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 8800/17300 kN ratings and 655000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 30/710 KM designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 710 mm (slash-size) = 710 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (8800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/710 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." }, { "q": "How is C 30/710 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 30/710 KM?", "a": "A C 30/710 KM measures 710 mm bore × 1030 mm outside diameter × 236 mm width (27.953 × 40.551 × 9.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8800 kN, static C0 17300 kN, fatigue limit Pu 1060 kN, reference speed 400 r/min, limiting speed 560 r/min, mass about 655000 g." } ], "cross_ref": [ { "equiv_sku": "C30-710-M", "equiv_brand": "SKF", "level": "full", "note": "Same 710×1030×236 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/710 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-710-KM", "C 30/710 KM" ], "locale_variants": {} }, { "sku": "C40-710-M", "brand": "SKF", "manufacturer_designation": "C 40/710 M", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 710, "D_mm": 1030, "B_mm": 315, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 10600, "static_load_kN": 21600, "fatigue_load_limit_kN": 1320, "reference_speed_rpm": 320, "limiting_speed_rpm": 430, "max_rpm": 430, "weight_g": 865000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 40/710 M is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 710 mm bore, 1030 mm OD, 315 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (710 mm (slash-size)) encode the 710 mm bore; suffixes describe bore and execution. The cylindrical 710 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 710×1030×315 mm are identical — only the mounting method changes. The 865000 g mass over the 710×1030×315 mm envelope yields about 14.93 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 710 mm bore the 865 kg mass and 315 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 320 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 40/710 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 10600/21600 kN ratings belong to this exact execution (C 40/710 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 10600/21600 kN ratings and 865000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 40/710 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 40/710 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 40/710 M have?", "a": "A C 40/710 M measures 710 mm bore × 1030 mm outside diameter × 315 mm width (27.953 × 40.551 × 12.402 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10600 kN, static C0 21600 kN, fatigue limit Pu 1320 kN, reference speed 320 r/min, limiting speed 430 r/min, mass about 865000 g." } ], "cross_ref": [ { "equiv_sku": "C40-710-K30M", "equiv_brand": "SKF", "level": "full", "note": "Same 710×1030×315 mm ISO 15 envelope and equivalent catalogue C/C0; C 40/710 K30M is the 1:30 tapered-bore K30 M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C40-710-M", "C 40/710 M" ], "locale_variants": {} }, { "sku": "C40-710-K30M", "brand": "SKF", "manufacturer_designation": "C 40/710 K30M", "series": "C4000-series", "type": "carb_toroidal", "d_mm": 710, "D_mm": 1030, "B_mm": 315, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 10600, "static_load_kN": 21600, "fatigue_load_limit_kN": 1320, "reference_speed_rpm": 320, "limiting_speed_rpm": 430, "max_rpm": 430, "weight_g": 865000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 40/710 K30M belongs to the CARB family — compact aligning roller bearings: envelope 710×1030×315 mm, radial rating 10600/21600 kN C/C0, and no axial-locating function by design. In C 40/710 K30M the 40 dimension series fixes the 1030 mm OD and 315 mm width around the 710 mm bore (the bore is written directly after the slash (no bore code)); the suffix K30M then selects the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 710 mm seat. Selection arithmetic: C 10600 kN against C0 21600 kN gives a C0/C ratio of 2.04, and the 1320 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the withdrawal (AH) sleeve matched to the 1:30 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 315 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 710 mm bore the 865 kg mass and 315 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 40/710 K30M must float; the two are designed to be used as a pair.", "The quoted 10600/21600 kN ratings belong to this exact execution (C 40/710 K30M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 40/710 K30M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 10600/21600 kN ratings and 865000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 40/710 K30M mounted?", "a": "The tapered 1:30 bore mounts on a withdrawal (AH) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 40/710 K30M?", "a": "A C 40/710 K30M measures 710 mm bore × 1030 mm outside diameter × 315 mm width (27.953 × 40.551 × 12.402 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10600 kN, static C0 21600 kN, fatigue limit Pu 1320 kN, reference speed 320 r/min, limiting speed 430 r/min, mass about 865000 g." }, { "q": "Can a CARB bearing like C 40/710 K30M locate the shaft axially?", "a": "No — that is the defining feature. C 40/710 K30M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 40/710 K30M designation read?", "a": "C = CARB toroidal family; 40 = dimension series; 710 mm (slash-size) = 710 mm bore (the bore is written directly after the slash (no bore code)); suffix K30M selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C40-710-M", "equiv_brand": "SKF", "level": "full", "note": "Same 710×1030×315 mm ISO 15 envelope and equivalent catalogue C/C0; C 40/710 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C40-710-K30M", "C 40/710 K30M" ], "locale_variants": {} }, { "sku": "C31-710-MB", "brand": "SKF", "manufacturer_designation": "C 31/710 MB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 710, "D_mm": 1150, "B_mm": 345, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 13400, "static_load_kN": 25500, "fatigue_load_limit_kN": 1530, "reference_speed_rpm": 340, "limiting_speed_rpm": 480, "max_rpm": 480, "weight_g": 1470000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 31/710 MB: the toroidal rollers allow the 710 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 31/710 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 710 mm seat. Speed planning separates the 340 r/min thermal reference from the 480 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1150 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 710 mm bore the 1470 kg mass and 345 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 340 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 31/710 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 13400/25500 kN ratings belong to this exact execution (C 31/710 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 13400/25500 kN ratings and 1470000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 31/710 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 31/710 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 31/710 MB have?", "a": "A C 31/710 MB measures 710 mm bore × 1150 mm outside diameter × 345 mm width (27.953 × 45.276 × 13.583 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13400 kN, static C0 25500 kN, fatigue limit Pu 1530 kN, reference speed 340 r/min, limiting speed 480 r/min, mass about 1470000 g." } ], "cross_ref": [ { "equiv_sku": "C31-710-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 710×1150×345 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/710 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-710-MB", "C 31/710 MB" ], "locale_variants": {} }, { "sku": "C31-710-KMB", "brand": "SKF", "manufacturer_designation": "C 31/710 KMB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 710, "D_mm": 1150, "B_mm": 345, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 13400, "static_load_kN": 25500, "fatigue_load_limit_kN": 1530, "reference_speed_rpm": 340, "limiting_speed_rpm": 480, "max_rpm": 480, "weight_g": 1470000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 31/710 KMB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 710×1150×345 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 31/710 KMB the 31 dimension series fixes the 1150 mm OD and 345 mm width around the 710 mm bore (the bore is written directly after the slash (no bore code)); the suffix KMB then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 710 mm seat. Selection arithmetic: C 13400 kN against C0 25500 kN gives a C0/C ratio of 1.90, and the 1530 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1150 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 710 mm bore the 1470 kg mass and 345 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 31/710 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 340 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 13400/25500 kN ratings belong to this exact execution (C 31/710 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 13400/25500 kN ratings and 1470000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is the C 31/710 KMB designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 710 mm (slash-size) = 710 mm bore (the bore is written directly after the slash (no bore code)); suffix KMB selects tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (13400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/710 KMB is the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 31/710 KMB mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 31/710 KMB?", "a": "A C 31/710 KMB measures 710 mm bore × 1150 mm outside diameter × 345 mm width (27.953 × 45.276 × 13.583 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13400 kN, static C0 25500 kN, fatigue limit Pu 1530 kN, reference speed 340 r/min, limiting speed 480 r/min, mass about 1470000 g." } ], "cross_ref": [ { "equiv_sku": "C31-710-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 710×1150×345 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/710 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-710-KMB", "C 31/710 KMB" ], "locale_variants": {} }, { "sku": "C39-750-M", "brand": "SKF", "manufacturer_designation": "C 39/750 M", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 750, "D_mm": 1000, "B_mm": 185, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6100, "static_load_kN": 13400, "fatigue_load_limit_kN": 815, "reference_speed_rpm": 430, "limiting_speed_rpm": 560, "max_rpm": 560, "weight_g": 410000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 39/750 M in the dimension series 39 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 39/750 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The cylindrical 750 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 750×1000×185 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 185 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1000 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 750 mm bore the 410 kg mass and 185 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 750 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 39/750 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 6100/13400 kN ratings belong to this exact execution (C 39/750 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 6100/13400 kN ratings and 410000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 39/750 M mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 750 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 39/750 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 39/750 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C39-750-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 750×1000×185 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/750 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-750-M", "C 39/750 M" ], "locale_variants": {} }, { "sku": "C39-750-KM", "brand": "SKF", "manufacturer_designation": "C 39/750 KM", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 750, "D_mm": 1000, "B_mm": 185, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6100, "static_load_kN": 13400, "fatigue_load_limit_kN": 815, "reference_speed_rpm": 430, "limiting_speed_rpm": 560, "max_rpm": 560, "weight_g": 410000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 39/750 KM is the dimension series 39 CARB toroidal roller bearings member of the CARB range: 750 mm bore, 1000 mm OD, 185 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (750 mm (slash-size)) encode the 750 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 750 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 750×1000×185 mm are identical — only the mounting method changes. Speed planning separates the 430 r/min thermal reference from the 560 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 185 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 750 mm bore the 410 kg mass and 185 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/750 KM must float; the two are designed to be used as a pair.", "Never use C 39/750 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 750 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 6100/13400 kN ratings and 410000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 39/750 KM have?", "a": "A C 39/750 KM measures 750 mm bore × 1000 mm outside diameter × 185 mm width (29.528 × 39.37 × 7.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6100 kN, static C0 13400 kN, fatigue limit Pu 815 kN, reference speed 430 r/min, limiting speed 560 r/min, mass about 410000 g." }, { "q": "What does C 39/750 KM mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 750 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 39/750 KM used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C39-750-M", "equiv_brand": "SKF", "level": "full", "note": "Same 750×1000×185 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/750 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-750-KM", "C 39/750 KM" ], "locale_variants": {} }, { "sku": "C30-750-MB", "brand": "SKF", "manufacturer_designation": "C 30/750 MB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 750, "D_mm": 1090, "B_mm": 250, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9500, "static_load_kN": 19300, "fatigue_load_limit_kN": 1160, "reference_speed_rpm": 380, "limiting_speed_rpm": 530, "max_rpm": 530, "weight_g": 838000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/750 MB belongs to the CARB family — compact aligning roller bearings: envelope 750×1090×250 mm, radial rating 9500/19300 kN C/C0, and no axial-locating function by design. In C 30/750 MB the 30 dimension series fixes the 1090 mm OD and 250 mm width around the 750 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The cylindrical 750 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 750×1090×250 mm are identical — only the mounting method changes. The 838000 g mass over the 750×1090×250 mm envelope yields about 12.67 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 250 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 750 mm bore the 838 kg mass and 250 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 380 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 9500/19300 kN ratings belong to this exact execution (C 30/750 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/750 MB must float; the two are designed to be used as a pair.", "The 9500/19300 kN ratings and 838000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 30/750 MB locate the shaft axially?", "a": "No — that is the defining feature. C 30/750 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 30/750 MB designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 750 mm (slash-size) = 750 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (9500 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/750 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 30/750 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 750 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 250 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C30-750-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 750×1090×250 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/750 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-750-MB", "C 30/750 MB" ], "locale_variants": {} }, { "sku": "C30-750-KMB", "brand": "SKF", "manufacturer_designation": "C 30/750 KMB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 750, "D_mm": 1090, "B_mm": 250, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9500, "static_load_kN": 19300, "fatigue_load_limit_kN": 1160, "reference_speed_rpm": 380, "limiting_speed_rpm": 530, "max_rpm": 530, "weight_g": 838000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/750 KMB belongs to the CARB family — compact aligning roller bearings: envelope 750×1090×250 mm, radial rating 9500/19300 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (750 mm (slash-size)) encode the 750 mm bore; suffixes describe bore and execution. The KMB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/750 KMB deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1090 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 750 mm bore the 838 kg mass and 250 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 750 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 380 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 9500/19300 kN ratings belong to this exact execution (C 30/750 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 9500/19300 kN ratings and 838000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 30/750 KMB mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 750 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 30/750 KMB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 30/750 KMB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C30-750-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 750×1090×250 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/750 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-750-KMB", "C 30/750 KMB" ], "locale_variants": {} }, { "sku": "C31-750-MB", "brand": "SKF", "manufacturer_designation": "C 31/750 MB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 750, "D_mm": 1220, "B_mm": 365, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 16000, "static_load_kN": 30500, "fatigue_load_limit_kN": 1800, "reference_speed_rpm": 320, "limiting_speed_rpm": 450, "max_rpm": 450, "weight_g": 1800000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 31/750 MB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 750 mm bore, 1220 mm OD, 365 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (750 mm (slash-size)) encode the 750 mm bore; suffixes describe bore and execution. The cylindrical 750 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 750×1220×365 mm are identical — only the mounting method changes. Selection arithmetic: C 16000 kN against C0 30500 kN gives a C0/C ratio of 1.91, and the 1800 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 750 mm bore the 1800 kg mass and 365 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 750 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 320 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 16000/30500 kN ratings belong to this exact execution (C 31/750 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 31/750 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 16000/30500 kN ratings and 1800000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 31/750 MB have?", "a": "A C 31/750 MB measures 750 mm bore × 1220 mm outside diameter × 365 mm width (29.528 × 48.031 × 14.37 in). From SKF catalogue PUB BU/P1 17000: dynamic C 16000 kN, static C0 30500 kN, fatigue limit Pu 1800 kN, reference speed 320 r/min, limiting speed 450 r/min, mass about 1800000 g." }, { "q": "What does C 31/750 MB mean in SKF part numbering?", "a": "C marks CARB; 31 the dimension series; the size code gives 750 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 31/750 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 31/750 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C31-750-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 750×1220×365 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/750 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-750-MB", "C 31/750 MB" ], "locale_variants": {} }, { "sku": "C31-750-KMB", "brand": "SKF", "manufacturer_designation": "C 31/750 KMB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 750, "D_mm": 1220, "B_mm": 365, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 16000, "static_load_kN": 30500, "fatigue_load_limit_kN": 1800, "reference_speed_rpm": 320, "limiting_speed_rpm": 450, "max_rpm": 450, "weight_g": 1800000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 31/750 KMB belongs to the CARB family — compact aligning roller bearings: envelope 750×1220×365 mm, radial rating 16000/30500 kN C/C0, and no axial-locating function by design. The designation C 31/750 KMB separates into C (CARB), 31 (dimension series), 750 mm (slash-size) (750 mm bore — bore 750 mm is written directly after the slash) and KMB (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)); envelope 750×1220×365 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 750 mm seat. Speed planning separates the 320 r/min thermal reference from the 450 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 750 mm bore the 1800 kg mass and 365 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/750 KMB must float; the two are designed to be used as a pair.", "Never use C 31/750 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 750 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 16000/30500 kN ratings and 1800000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 31/750 KMB locate the shaft axially?", "a": "No — that is the defining feature. C 31/750 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 31/750 KMB designation read?", "a": "C = CARB toroidal family; 31 = dimension series; 750 mm (slash-size) = 750 mm bore (the bore is written directly after the slash (no bore code)); suffix KMB selects tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (16000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/750 KMB is the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 31/750 KMB mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." } ], "cross_ref": [ { "equiv_sku": "C31-750-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 750×1220×365 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/750 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-750-KMB", "C 31/750 KMB" ], "locale_variants": {} }, { "sku": "C39-800-M", "brand": "SKF", "manufacturer_designation": "C 39/800 M", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 800, "D_mm": 1060, "B_mm": 195, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6400, "static_load_kN": 14600, "fatigue_load_limit_kN": 880, "reference_speed_rpm": 380, "limiting_speed_rpm": 530, "max_rpm": 530, "weight_g": 480000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 39/800 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 800×1060×195 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 39/800 M separates into C (CARB), 39 (dimension series), 800 mm (slash-size) (800 mm bore — bore 800 mm is written directly after the slash) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 800×1060×195 mm follows the ISO 15 plan. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 800 mm and larger sizes needing robust guidance under heavy load. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 39/800 M deliberately carries none. Mounting: slide the bearing onto the 800 mm seat or heat it (max 120 °C) and seat it square; never press through the 195 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 800 mm bore the 480 kg mass and 195 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/800 M must float; the two are designed to be used as a pair.", "Never use C 39/800 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 800 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 6400/14600 kN ratings and 480000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (6400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/800 M is the cylindrical bore for direct shaft fitting, machined brass M cage." }, { "q": "How is C 39/800 M mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 800 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 195 mm roller set." }, { "q": "What are the dimensions and ratings of the C 39/800 M?", "a": "A C 39/800 M measures 800 mm bore × 1060 mm outside diameter × 195 mm width (31.496 × 41.732 × 7.677 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6400 kN, static C0 14600 kN, fatigue limit Pu 880 kN, reference speed 380 r/min, limiting speed 530 r/min, mass about 480000 g." }, { "q": "Can a CARB bearing like C 39/800 M locate the shaft axially?", "a": "No — that is the defining feature. C 39/800 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-800-M", "C 39/800 M" ], "locale_variants": {} }, { "sku": "C30-800-MB", "brand": "SKF", "manufacturer_designation": "C 30/800 MB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 800, "D_mm": 1150, "B_mm": 258, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9300, "static_load_kN": 19300, "fatigue_load_limit_kN": 1140, "reference_speed_rpm": 360, "limiting_speed_rpm": 480, "max_rpm": 480, "weight_g": 941000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/800 MB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 800×1150×258 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (800 mm (slash-size)) encode the 800 mm bore; suffixes describe bore and execution. The cylindrical 800 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 800×1150×258 mm are identical — only the mounting method changes. Speed planning separates the 360 r/min thermal reference from the 480 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "hard-particle indentation where oil or grease filtration is inadequate", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 800 mm bore the 941 kg mass and 258 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/800 MB must float; the two are designed to be used as a pair.", "Never use C 30/800 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 800 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 9300/19300 kN ratings and 941000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Is the C 30/800 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 30/800 MB have?", "a": "A C 30/800 MB measures 800 mm bore × 1150 mm outside diameter × 258 mm width (31.496 × 45.276 × 10.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9300 kN, static C0 19300 kN, fatigue limit Pu 1140 kN, reference speed 360 r/min, limiting speed 480 r/min, mass about 941000 g." }, { "q": "What does C 30/800 MB mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 800 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." } ], "cross_ref": [ { "equiv_sku": "C30-800-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 800×1150×258 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/800 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-800-MB", "C 30/800 MB" ], "locale_variants": {} }, { "sku": "C30-800-KMB", "brand": "SKF", "manufacturer_designation": "C 30/800 KMB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 800, "D_mm": 1150, "B_mm": 258, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9300, "static_load_kN": 19300, "fatigue_load_limit_kN": 1140, "reference_speed_rpm": 360, "limiting_speed_rpm": 480, "max_rpm": 480, "weight_g": 941000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/800 KMB: the toroidal rollers allow the 800 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 30/800 KMB separates into C (CARB), 30 (dimension series), 800 mm (slash-size) (800 mm bore — bore 800 mm is written directly after the slash) and KMB (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)); envelope 800×1150×258 mm follows the ISO 15 plan. The KMB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/800 KMB deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1150 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "rolling-contact fatigue spalling after the catalogue L10 life is exhausted", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 800 mm bore the 941 kg mass and 258 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 30/800 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 800 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The quoted 9300/19300 kN ratings belong to this exact execution (C 30/800 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 9300/19300 kN ratings and 941000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 30/800 KMB mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 30/800 KMB?", "a": "A C 30/800 KMB measures 800 mm bore × 1150 mm outside diameter × 258 mm width (31.496 × 45.276 × 10.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9300 kN, static C0 19300 kN, fatigue limit Pu 1140 kN, reference speed 360 r/min, limiting speed 480 r/min, mass about 941000 g." }, { "q": "Can a CARB bearing like C 30/800 KMB locate the shaft axially?", "a": "No — that is the defining feature. C 30/800 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 30/800 KMB designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 800 mm (slash-size) = 800 mm bore (the bore is written directly after the slash (no bore code)); suffix KMB selects tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C30-800-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 800×1150×258 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/800 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-800-KMB", "C 30/800 KMB" ], "locale_variants": {} }, { "sku": "C39-850-M", "brand": "SKF", "manufacturer_designation": "C 39/850 M", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 850, "D_mm": 1120, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 7350, "static_load_kN": 16300, "fatigue_load_limit_kN": 960, "reference_speed_rpm": 360, "limiting_speed_rpm": 480, "max_rpm": 480, "weight_g": 540000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 39/850 M denotes a toroidal roller bearing whose 200 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 39/850 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 850 mm seat. Selection arithmetic: C 7350 kN against C0 16300 kN gives a C0/C ratio of 2.22, and the 960 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 850 mm bore the 540 kg mass and 200 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/850 M must float; the two are designed to be used as a pair.", "Never use C 39/850 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 850 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 360 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The 7350/16300 kN ratings and 540000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 39/850 M used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 39/850 M sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 39/850 M have?", "a": "A C 39/850 M measures 850 mm bore × 1120 mm outside diameter × 200 mm width (33.465 × 44.094 × 7.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 7350 kN, static C0 16300 kN, fatigue limit Pu 960 kN, reference speed 360 r/min, limiting speed 480 r/min, mass about 540000 g." } ], "cross_ref": [ { "equiv_sku": "C39-850-KM", "equiv_brand": "SKF", "level": "full", "note": "Same 850×1120×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/850 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-850-M", "C 39/850 M" ], "locale_variants": {} }, { "sku": "C39-850-KM", "brand": "SKF", "manufacturer_designation": "C 39/850 KM", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 850, "D_mm": 1120, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 7350, "static_load_kN": 16300, "fatigue_load_limit_kN": 960, "reference_speed_rpm": 360, "limiting_speed_rpm": 480, "max_rpm": 480, "weight_g": 540000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 39/850 KM denotes a toroidal roller bearing whose 200 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 39/850 KM separates into C (CARB), 39 (dimension series), 850 mm (slash-size) (850 mm bore — bore 850 mm is written directly after the slash) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 850×1120×200 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 850 mm shaft deflects; the 360 r/min reference and 480 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 39/850 KM deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1120 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 850 mm bore the 540 kg mass and 200 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 360 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 7350/16300 kN ratings belong to this exact execution (C 39/850 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 850 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Never use C 39/850 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 7350/16300 kN ratings and 540000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 39/850 KM locate the shaft axially?", "a": "No — that is the defining feature. C 39/850 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 39/850 KM designation read?", "a": "C = CARB toroidal family; 39 = dimension series; 850 mm (slash-size) = 850 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (7350 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/850 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage." }, { "q": "How is C 39/850 KM mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." } ], "cross_ref": [ { "equiv_sku": "C39-850-M", "equiv_brand": "SKF", "level": "full", "note": "Same 850×1120×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/850 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-850-KM", "C 39/850 KM" ], "locale_variants": {} }, { "sku": "C30-850-MB", "brand": "SKF", "manufacturer_designation": "C 30/850 MB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 850, "D_mm": 1220, "B_mm": 272, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 11600, "static_load_kN": 24500, "fatigue_load_limit_kN": 1430, "reference_speed_rpm": 320, "limiting_speed_rpm": 450, "max_rpm": 450, "weight_g": 1110000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 30/850 MB in the dimension series 30 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 30/850 MB the 30 dimension series fixes the 1220 mm OD and 272 mm width around the 850 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 850 mm shaft deflects; the 320 r/min reference and 450 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/850 MB deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1220 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 850 mm bore the 1110 kg mass and 272 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/850 MB must float; the two are designed to be used as a pair.", "Never use C 30/850 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 850 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 11600/24500 kN ratings and 1110000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (11600 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/850 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 30/850 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 850 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 272 mm roller set." }, { "q": "What are the dimensions and ratings of the C 30/850 MB?", "a": "A C 30/850 MB measures 850 mm bore × 1220 mm outside diameter × 272 mm width (33.465 × 48.031 × 10.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11600 kN, static C0 24500 kN, fatigue limit Pu 1430 kN, reference speed 320 r/min, limiting speed 450 r/min, mass about 1110000 g." }, { "q": "Can a CARB bearing like C 30/850 MB locate the shaft axially?", "a": "No — that is the defining feature. C 30/850 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C30-850-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 850×1220×272 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/850 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-850-MB", "C 30/850 MB" ], "locale_variants": {} }, { "sku": "C30-850-KMB", "brand": "SKF", "manufacturer_designation": "C 30/850 KMB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 850, "D_mm": 1220, "B_mm": 272, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 11600, "static_load_kN": 24500, "fatigue_load_limit_kN": 1430, "reference_speed_rpm": 320, "limiting_speed_rpm": 450, "max_rpm": 450, "weight_g": 1110000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/850 KMB belongs to the CARB family — compact aligning roller bearings: envelope 850×1220×272 mm, radial rating 11600/24500 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (850 mm (slash-size)) encode the 850 mm bore; suffixes describe bore and execution. The KMB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/850 KMB deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 272 mm wide cavity does not fill itself.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "brinelling of washer raceways from impact or mounting force applied through the rolling elements", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 850 mm bore the 1110 kg mass and 272 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 850 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 320 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/850 KMB must float; the two are designed to be used as a pair.", "The 11600/24500 kN ratings and 1110000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What does C 30/850 KMB mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 850 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 30/850 KMB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 30/850 KMB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." } ], "cross_ref": [ { "equiv_sku": "C30-850-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 850×1220×272 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/850 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-850-KMB", "C 30/850 KMB" ], "locale_variants": {} }, { "sku": "C30-900-MB", "brand": "SKF", "manufacturer_designation": "C 30/900 MB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 900, "D_mm": 1280, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 12700, "static_load_kN": 26500, "fatigue_load_limit_kN": 1530, "reference_speed_rpm": 300, "limiting_speed_rpm": 400, "max_rpm": 400, "weight_g": 1200000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 30/900 MB belongs to the CARB family — compact aligning roller bearings: envelope 900×1280×280 mm, radial rating 12700/26500 kN C/C0, and no axial-locating function by design. The designation C 30/900 MB separates into C (CARB), 30 (dimension series), 900 mm (slash-size) (900 mm bore — bore 900 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 900×1280×280 mm follows the ISO 15 plan. The MB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Selection arithmetic: C 12700 kN against C0 26500 kN gives a C0/C ratio of 2.09, and the 1530 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 900 mm bore the 1200 kg mass and 280 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 12700/26500 kN ratings belong to this exact execution (C 30/900 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 30/900 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 900 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 12700/26500 kN ratings and 1200000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 30/900 MB locate the shaft axially?", "a": "No — that is the defining feature. C 30/900 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 30/900 MB designation read?", "a": "C = CARB toroidal family; 30 = dimension series; 900 mm (slash-size) = 900 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (12700 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/900 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 30/900 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 900 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 280 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C30-900-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 900×1280×280 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/900 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-900-MB", "C 30/900 MB" ], "locale_variants": {} }, { "sku": "C30-900-KMB", "brand": "SKF", "manufacturer_designation": "C 30/900 KMB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 900, "D_mm": 1280, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 12700, "static_load_kN": 26500, "fatigue_load_limit_kN": 1530, "reference_speed_rpm": 300, "limiting_speed_rpm": 400, "max_rpm": 400, "weight_g": 1200000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/900 KMB: the toroidal rollers allow the 900 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (900 mm (slash-size)) encode the 900 mm bore; suffixes describe bore and execution. The KMB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 280 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 280 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 900 mm bore the 1200 kg mass and 280 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/900 KMB must float; the two are designed to be used as a pair.", "Never use C 30/900 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 900 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "The 12700/26500 kN ratings and 1200000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 30/900 KMB have?", "a": "A C 30/900 KMB measures 900 mm bore × 1280 mm outside diameter × 280 mm width (35.433 × 50.394 × 11.024 in). From SKF catalogue PUB BU/P1 17000: dynamic C 12700 kN, static C0 26500 kN, fatigue limit Pu 1530 kN, reference speed 300 r/min, limiting speed 400 r/min, mass about 1200000 g." }, { "q": "What does C 30/900 KMB mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 900 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 30/900 KMB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C30-900-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 900×1280×280 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/900 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-900-KMB", "C 30/900 KMB" ], "locale_variants": {} }, { "sku": "C30-950-MB", "brand": "SKF", "manufacturer_designation": "C 30/950 MB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 950, "D_mm": 1360, "B_mm": 300, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 13200, "static_load_kN": 28500, "fatigue_load_limit_kN": 1600, "reference_speed_rpm": 280, "limiting_speed_rpm": 380, "max_rpm": 380, "weight_g": 1480000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/950 MB: the toroidal rollers allow the 950 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (950 mm (slash-size)) encode the 950 mm bore; suffixes describe bore and execution. The cylindrical 950 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 950×1360×300 mm are identical — only the mounting method changes. The 1480000 g mass over the 950×1360×300 mm envelope yields about 13.89 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 950 mm bore the 1480 kg mass and 300 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 950 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 280 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "Never use C 30/950 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 13200/28500 kN ratings belong to this exact execution (C 30/950 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 13200/28500 kN ratings and 1480000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 30/950 MB have?", "a": "A C 30/950 MB measures 950 mm bore × 1360 mm outside diameter × 300 mm width (37.402 × 53.543 × 11.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13200 kN, static C0 28500 kN, fatigue limit Pu 1600 kN, reference speed 280 r/min, limiting speed 380 r/min, mass about 1480000 g." }, { "q": "What does C 30/950 MB mean in SKF part numbering?", "a": "C marks CARB; 30 the dimension series; the size code gives 950 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 30/950 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 30/950 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-950-MB", "C 30/950 MB" ], "locale_variants": {} }, { "sku": "C30-1000-MB", "brand": "SKF", "manufacturer_designation": "C 30/1000 MB", "series": "C3000-series", "type": "carb_toroidal", "d_mm": 1000, "D_mm": 1420, "B_mm": 308, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 13700, "static_load_kN": 30500, "fatigue_load_limit_kN": 1700, "reference_speed_rpm": 260, "limiting_speed_rpm": 360, "max_rpm": 360, "weight_g": 1680000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 30/1000 MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 1000 mm bore, 1420 mm outside diameter, 308 mm wide unit rated 13700 kN dynamic. In C 30/1000 MB the 30 dimension series fixes the 1420 mm OD and 308 mm width around the 1000 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 1000 mm shaft deflects; the 260 r/min reference and 360 r/min limiting speed are both catalogue values. Selection arithmetic: C 13700 kN against C0 30500 kN gives a C0/C ratio of 2.23, and the 1700 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 308 mm wide cavity does not fill itself.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 1000 mm bore the 1680 kg mass and 308 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 30/1000 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 1000 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 260 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 13700/30500 kN ratings belong to this exact execution (C 30/1000 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 13700/30500 kN ratings and 1680000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (13700 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/1000 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 30/1000 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 1000 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 308 mm roller set." }, { "q": "What are the dimensions and ratings of the C 30/1000 MB?", "a": "A C 30/1000 MB measures 1000 mm bore × 1420 mm outside diameter × 308 mm width (39.37 × 55.906 × 12.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13700 kN, static C0 30500 kN, fatigue limit Pu 1700 kN, reference speed 260 r/min, limiting speed 360 r/min, mass about 1680000 g." }, { "q": "Can a CARB bearing like C 30/1000 MB locate the shaft axially?", "a": "No — that is the defining feature. C 30/1000 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-1000-MB", "C 30/1000 MB" ], "locale_variants": {} }, { "sku": "C31-1000-MB", "brand": "SKF", "manufacturer_designation": "C 31/1000 MB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 1000, "D_mm": 1580, "B_mm": 462, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 20400, "static_load_kN": 45500, "fatigue_load_limit_kN": 2500, "reference_speed_rpm": 220, "limiting_speed_rpm": 300, "max_rpm": 300, "weight_g": 3800000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 31/1000 MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 1000 mm bore, 1580 mm outside diameter, 462 mm wide unit rated 20400 kN dynamic. In C 31/1000 MB the 31 dimension series fixes the 1580 mm OD and 462 mm width around the 1000 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The cylindrical 1000 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 1000×1580×462 mm are identical — only the mounting method changes. Speed planning separates the 220 r/min thermal reference from the 300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1580 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 1000 mm bore the 3800 kg mass and 462 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 220 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 20400/45500 kN ratings belong to this exact execution (C 31/1000 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/1000 MB must float; the two are designed to be used as a pair.", "Never use C 31/1000 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 20400/45500 kN ratings and 3800000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (20400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/1000 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 31/1000 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 1000 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 462 mm roller set." }, { "q": "What are the dimensions and ratings of the C 31/1000 MB?", "a": "A C 31/1000 MB measures 1000 mm bore × 1580 mm outside diameter × 462 mm width (39.37 × 62.205 × 18.189 in). From SKF catalogue PUB BU/P1 17000: dynamic C 20400 kN, static C0 45500 kN, fatigue limit Pu 2500 kN, reference speed 220 r/min, limiting speed 300 r/min, mass about 3800000 g." }, { "q": "Can a CARB bearing like C 31/1000 MB locate the shaft axially?", "a": "No — that is the defining feature. C 31/1000 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C31-1000-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 1000×1580×462 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/1000 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-1000-MB", "C 31/1000 MB" ], "locale_variants": {} }, { "sku": "C31-1000-KMB", "brand": "SKF", "manufacturer_designation": "C 31/1000 KMB", "series": "C3100-series", "type": "carb_toroidal", "d_mm": 1000, "D_mm": 1580, "B_mm": 462, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 20400, "static_load_kN": 45500, "fatigue_load_limit_kN": 2500, "reference_speed_rpm": 220, "limiting_speed_rpm": 300, "max_rpm": 300, "weight_g": 3800000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 31/1000 KMB denotes a toroidal roller bearing whose 462 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 31/1000 KMB the 31 dimension series fixes the 1580 mm OD and 462 mm width around the 1000 mm bore (the bore is written directly after the slash (no bore code)); the suffix KMB then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 1000 mm shaft deflects; the 220 r/min reference and 300 r/min limiting speed are both catalogue values. Selection arithmetic: C 20400 kN against C0 45500 kN gives a C0/C ratio of 2.23, and the 2500 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 462 mm wide cavity does not fill itself.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 1000 mm bore the 3800 kg mass and 462 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/1000 KMB must float; the two are designed to be used as a pair.", "Reference and limiting speeds are different limits: the 220 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 20400/45500 kN ratings belong to this exact execution (C 31/1000 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 20400/45500 kN ratings and 3800000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (20400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/1000 KMB is the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 31/1000 KMB mounted?", "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards." }, { "q": "What are the dimensions and ratings of the C 31/1000 KMB?", "a": "A C 31/1000 KMB measures 1000 mm bore × 1580 mm outside diameter × 462 mm width (39.37 × 62.205 × 18.189 in). From SKF catalogue PUB BU/P1 17000: dynamic C 20400 kN, static C0 45500 kN, fatigue limit Pu 2500 kN, reference speed 220 r/min, limiting speed 300 r/min, mass about 3800000 g." }, { "q": "Can a CARB bearing like C 31/1000 KMB locate the shaft axially?", "a": "No — that is the defining feature. C 31/1000 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C31-1000-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 1000×1580×462 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/1000 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-1000-KMB", "C 31/1000 KMB" ], "locale_variants": {} }, { "sku": "C39-1060-MB", "brand": "SKF", "manufacturer_designation": "C 39/1060 MB", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 1060, "D_mm": 1400, "B_mm": 250, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 11000, "static_load_kN": 26000, "fatigue_load_limit_kN": 1430, "reference_speed_rpm": 260, "limiting_speed_rpm": 360, "max_rpm": 360, "weight_g": 1120000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 39/1060 MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 1060 mm bore, 1400 mm outside diameter, 250 mm wide unit rated 11000 kN dynamic. The designation C 39/1060 MB separates into C (CARB), 39 (dimension series), 1060 mm (slash-size) (1060 mm bore — bore 1060 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 1060×1400×250 mm follows the ISO 15 plan. The cylindrical 1060 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 1060×1400×250 mm are identical — only the mounting method changes. Speed planning separates the 260 r/min thermal reference from the 360 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "abrasive paste forming as dust bypasses the housing seals into the open washer set" ], "pitfalls": [ "At 1060 mm bore the 1120 kg mass and 250 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Never use C 39/1060 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 1060 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/1060 MB must float; the two are designed to be used as a pair.", "The 11000/26000 kN ratings and 1120000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (11000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/1060 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 39/1060 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 1060 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 250 mm roller set." }, { "q": "What are the dimensions and ratings of the C 39/1060 MB?", "a": "A C 39/1060 MB measures 1060 mm bore × 1400 mm outside diameter × 250 mm width (41.732 × 55.118 × 9.843 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11000 kN, static C0 26000 kN, fatigue limit Pu 1430 kN, reference speed 260 r/min, limiting speed 360 r/min, mass about 1120000 g." }, { "q": "Can a CARB bearing like C 39/1060 MB locate the shaft axially?", "a": "No — that is the defining feature. C 39/1060 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." } ], "cross_ref": [ { "equiv_sku": "C39-1060-KMB", "equiv_brand": "SKF", "level": "full", "note": "Same 1060×1400×250 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/1060 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-1060-MB", "C 39/1060 MB" ], "locale_variants": {} }, { "sku": "C39-1060-KMB", "brand": "SKF", "manufacturer_designation": "C 39/1060 KMB", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 1060, "D_mm": 1400, "B_mm": 250, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 11000, "static_load_kN": 26000, "fatigue_load_limit_kN": 1430, "reference_speed_rpm": 260, "limiting_speed_rpm": 360, "max_rpm": 360, "weight_g": 1120000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The CARB bearing C 39/1060 KMB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 1060 mm bore, 1400 mm outside diameter, 250 mm wide unit rated 11000 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (1060 mm (slash-size)) encode the 1060 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 1060 mm shaft deflects; the 260 r/min reference and 360 r/min limiting speed are both catalogue values. Selection arithmetic: C 11000 kN against C0 26000 kN gives a C0/C ratio of 2.36, and the 1430 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 250 mm wide cavity does not fill itself.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 1060 mm bore the 1120 kg mass and 250 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/1060 KMB must float; the two are designed to be used as a pair.", "Never use C 39/1060 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "Reference and limiting speeds are different limits: the 260 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 11000/26000 kN ratings belong to this exact execution (C 39/1060 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "The 11000/26000 kN ratings and 1120000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Which dimensions does the C 39/1060 KMB have?", "a": "A C 39/1060 KMB measures 1060 mm bore × 1400 mm outside diameter × 250 mm width (41.732 × 55.118 × 9.843 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11000 kN, static C0 26000 kN, fatigue limit Pu 1430 kN, reference speed 260 r/min, limiting speed 360 r/min, mass about 1120000 g." }, { "q": "What does C 39/1060 KMB mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 1060 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 39/1060 KMB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 39/1060 KMB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." } ], "cross_ref": [ { "equiv_sku": "C39-1060-MB", "equiv_brand": "SKF", "level": "full", "note": "Same 1060×1400×250 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/1060 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-1060-KMB", "C 39/1060 KMB" ], "locale_variants": {} }, { "sku": "C49-1120-MB1", "brand": "SKF", "manufacturer_designation": "C 49/1120 MB1", "series": "C4900-series", "type": "carb_toroidal", "d_mm": 1120, "D_mm": 1460, "B_mm": 335, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 13200, "static_load_kN": 31500, "fatigue_load_limit_kN": 1700, "reference_speed_rpm": 200, "limiting_speed_rpm": 260, "max_rpm": 260, "weight_g": 1630000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 49/1120 MB1 belongs to the CARB family — compact aligning roller bearings: envelope 1120×1460×335 mm, radial rating 13200/31500 kN C/C0, and no axial-locating function by design. In C 49/1120 MB1 the 49 dimension series fixes the 1460 mm OD and 335 mm width around the 1120 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB1 then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The MB1 suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 335 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 1120 mm seat or heat it (max 120 °C) and seat it square; never press through the 335 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "thermal preloading when a shaft is located at both ends and growth has nowhere to go", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "electrical erosion of raceways on VFD-driven shafts without grounding or insulation", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 1120 mm bore the 1630 kg mass and 335 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 200 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 13200/31500 kN ratings belong to this exact execution (C 49/1120 MB1); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 1120 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Never use C 49/1120 MB1 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 13200/31500 kN ratings and 1630000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Can a CARB bearing like C 49/1120 MB1 locate the shaft axially?", "a": "No — that is the defining feature. C 49/1120 MB1 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 49/1120 MB1 designation read?", "a": "C = CARB toroidal family; 49 = dimension series; 1120 mm (slash-size) = 1120 mm bore (the bore is written directly after the slash (no bore code)); suffix MB1 selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." }, { "q": "What is the difference between V and TN9 CARB executions?", "a": "V is the full-complement execution with no cage — more rollers, higher C (13200 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 49/1120 MB1 is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)." }, { "q": "How is C 49/1120 MB1 mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 1120 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 335 mm roller set." } ], "cross_ref": [ { "equiv_sku": "C49", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C49-1120-MB1", "C 49/1120 MB1" ], "locale_variants": {} }, { "sku": "C39-1180-MB", "brand": "SKF", "manufacturer_designation": "C 39/1180 MB", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 1180, "D_mm": 1540, "B_mm": 272, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 13400, "static_load_kN": 33500, "fatigue_load_limit_kN": 1800, "reference_speed_rpm": 220, "limiting_speed_rpm": 300, "max_rpm": 300, "weight_g": 1400000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 39/1180 MB denotes a toroidal roller bearing whose 272 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 39/1180 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. The cylindrical 1180 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 1180×1540×272 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 272 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1540 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "edge loading and premature spalling when the CARB position is blocked from its designed axial float", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "grease churning and overheating when a high-speed thrust position is over-packed" ], "pitfalls": [ "At 1180 mm bore the 1400 kg mass and 272 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/1180 MB must float; the two are designed to be used as a pair.", "Never use C 39/1180 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The quoted 13400/33500 kN ratings belong to this exact execution (C 39/1180 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.", "The 13400/33500 kN ratings and 1400000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "Why is C 39/1180 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." }, { "q": "Is the C 39/1180 MB sealed?", "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size." }, { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 39/1180 MB have?", "a": "A C 39/1180 MB measures 1180 mm bore × 1540 mm outside diameter × 272 mm width (46.457 × 60.63 × 10.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13400 kN, static C0 33500 kN, fatigue limit Pu 1800 kN, reference speed 220 r/min, limiting speed 300 r/min, mass about 1400000 g." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-1180-MB", "C 39/1180 MB" ], "locale_variants": {} }, { "sku": "C39-1500-MB", "brand": "SKF", "manufacturer_designation": "C 39/1500 MB", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 1500, "D_mm": 1950, "B_mm": 335, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 19600, "static_load_kN": 48000, "fatigue_load_limit_kN": 2400, "reference_speed_rpm": 140, "limiting_speed_rpm": 200, "max_rpm": 200, "weight_g": 2710000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "C 39/1500 MB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 1500×1950×335 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 39/1500 MB the 39 dimension series fixes the 1950 mm OD and 335 mm width around the 1500 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The cylindrical 1500 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 1500×1950×335 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 39/1500 MB deliberately carries none. Mounting: slide the bearing onto the 1500 mm seat or heat it (max 120 °C) and seat it square; never press through the 335 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling once the catalogue L10 life is exceeded or after sustained overload", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions", "false brinelling and rust-red witness marks on standby machines under external vibration", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 1500 mm bore the 2710 kg mass and 335 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Reference and limiting speeds are different limits: the 140 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 19600/48000 kN ratings belong to this exact execution (C 39/1500 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/1500 MB must float; the two are designed to be used as a pair.", "Never use C 39/1500 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 19600/48000 kN ratings and 2710000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "How is C 39/1500 MB mounted?", "a": "Slide or heat (max 120 °C) the bearing onto the 1500 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 335 mm roller set." }, { "q": "What are the dimensions and ratings of the C 39/1500 MB?", "a": "A C 39/1500 MB measures 1500 mm bore × 1950 mm outside diameter × 335 mm width (59.055 × 76.772 × 13.189 in). From SKF catalogue PUB BU/P1 17000: dynamic C 19600 kN, static C0 48000 kN, fatigue limit Pu 2400 kN, reference speed 140 r/min, limiting speed 200 r/min, mass about 2710000 g." }, { "q": "Can a CARB bearing like C 39/1500 MB locate the shaft axially?", "a": "No — that is the defining feature. C 39/1500 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust." }, { "q": "How is the C 39/1500 MB designation read?", "a": "C = CARB toroidal family; 39 = dimension series; 1500 mm (slash-size) = 1500 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-1500-MB", "C 39/1500 MB" ], "locale_variants": {} }, { "sku": "C39-1700-MB", "brand": "SKF", "manufacturer_designation": "C 39/1700 MB", "series": "C3900-series", "type": "carb_toroidal", "d_mm": 1700, "D_mm": 2180, "B_mm": 355, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 24000, "static_load_kN": 62000, "fatigue_load_limit_kN": 3000, "reference_speed_rpm": 110, "limiting_speed_rpm": 150, "max_rpm": 150, "weight_g": 3510000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists C 39/1700 MB in the dimension series 39 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (1700 mm (slash-size)) encode the 1700 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 1700 mm seat. Selection arithmetic: C 24000 kN against C0 62000 kN gives a C0/C ratio of 2.58, and the 3000 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 355 mm wide cavity does not fill itself.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "roller-end and flange smearing after lubricant starvation at the long roller contacts", "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders", "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit", "condensation pitting in machines that run intermittently in humid environments", "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips" ], "pitfalls": [ "At 1700 mm bore the 3510 kg mass and 355 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.", "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 1700 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.", "Reference and limiting speeds are different limits: the 110 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.", "The quoted 24000/62000 kN ratings belong to this exact execution (C 39/1700 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.", "Never use C 39/1700 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.", "The 24000/62000 kN ratings and 3510000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only." ], "faq": [ { "q": "What fails first on a misapplied CARB bearing?", "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running." }, { "q": "Which dimensions does the C 39/1700 MB have?", "a": "A C 39/1700 MB measures 1700 mm bore × 2180 mm outside diameter × 355 mm width (66.929 × 85.827 × 13.976 in). From SKF catalogue PUB BU/P1 17000: dynamic C 24000 kN, static C0 62000 kN, fatigue limit Pu 3000 kN, reference speed 110 r/min, limiting speed 150 r/min, mass about 3510000 g." }, { "q": "What does C 39/1700 MB mean in SKF part numbering?", "a": "C marks CARB; 39 the dimension series; the size code gives 1700 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ." }, { "q": "Why is C 39/1700 MB used opposite a spherical roller bearing?", "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 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. 10.1 CARB toroidal roller bearings", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-1700-MB", "C 39/1700 MB" ], "locale_variants": {} }, { "sku": "C2206-KTN9-H306-E", "brand": "SKF", "manufacturer_designation": "SKF C 2206 KTN9 + H 306 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 25, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 69.5, "static_load_kN": 62, "fatigue_load_limit_kN": 7.2, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " What the H execution changes: an adapter sleeve clamps the 30 mm tapered bore onto a plain 25 mm shaft, so the housing-side location work happens at the sleeve locknut — no machined shaft shoulder is needed at the bearing seat. With a combined mass of 0.4 kg over the 25×62×20 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. The locknut torque of H 306 E sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 30 mm CARB bearing and overheats the unit within hours. Housing side of C2206-KTN9-H306-E is conventional: a 62 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 25 mm shaft.SKF C 2206 KTN9 + H 306 E is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 2206 KTN9, adapter sleeve H 306 E, fitting a 25 mm cylindrical shaft seat at 62 mm housing diameter.Numbering logic: the bearing half C 2206 KTN9 follows the CARB works numbering (type C, dimension series, 30 mm bore), while H 306 E identifies the sleeve execution for that bore; the combo C2206-KTN9-H306-E exists in the catalogue so that shaft (25 mm), housing (62 mm) and both components are specified with one order number.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2206-KTN9-H306-E unit — replace the sleeve with the bearing.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2206-KTN9-H306-E and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Never set C2206-KTN9-H306-E by locknut torque or \"feel\": the adapter sleeve travel defines the clearance of the 30 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 69.5/62 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2206 KTN9 + H 306 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2206-KTN9-H306-E?", "a": "The unit is CARB bearing C 2206 KTN9 on adapter sleeve H 306 E, fitting a 25 mm shaft (0.984 in), housing bore 62 mm, bearing width 20 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 69.5 kN, C0 62 kN, fatigue load limit Pu 7.2 kN, combined mass about 0.4 kg. Reference speed 11,000 r/min, limiting speed 15,000 r/min (bearing values)." }, { "q": "Why does C2206-KTN9-H306-E list a 25 mm shaft size when the bearing bore is 30 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 306 E has a tapered outside that engages the bearing's 30 mm tapered bore and a cylindrical bore that seats on the 25 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2206-KTN9-H306-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2206 KTN9 and the sleeve H 306 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2206-KTN9-H306-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2206-KTN9-H306-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 25 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2206-KTN9-H306-E", "SKF C 2206 KTN9 + H 306 E", "C 2206 KTN9 + H 306 E", "C 2206 KTN9", "H 306 E" ], "locale_variants": {}, "reference_speed_rpm": 11000, "limiting_speed_rpm": 15000, "max_rpm": 15000 }, { "sku": "C2207-KTN9-H307-E", "brand": "SKF", "manufacturer_designation": "SKF C 2207 KTN9 + H 307 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 30, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 83, "static_load_kN": 80, "fatigue_load_limit_kN": 9.3, "weight_g": 590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The C2207-KTN9-H307-E unit pairs the 35 mm-bore CARB toroidal roller bearing C 2207 KTN9 with adapter sleeve H 307 E, so it mounts on a plain cylindrical 30 mm shaft without a precision shoulder.Numbering logic: the bearing half C 2207 KTN9 follows the CARB works numbering (type C, dimension series, 35 mm bore), while H 307 E identifies the sleeve execution for that bore; the combo C2207-KTN9-H307-E exists in the catalogue so that shaft (30 mm), housing (72 mm) and both components are specified with one order number. Adapter sleeve H 307 E: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 30 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. Dividing C 83 kN by the 35 mm bore gives 2.37 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 30 mm seat is fixed and the life requirement is not. Dismounting: release the locknut of H 307 E, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2207 KTN9 and H 307 E must be checked against the application temperature before substitution.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve H 307 E onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not run C2207-KTN9-H307-E as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2207-KTN9-H307-E and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 83/80 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2207 KTN9 + H 307 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2207-KTN9-H307-E?", "a": "The unit is CARB bearing C 2207 KTN9 on adapter sleeve H 307 E, fitting a 30 mm shaft (1.181 in), housing bore 72 mm, bearing width 23 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 83 kN, C0 80 kN, fatigue load limit Pu 9.3 kN, combined mass about 0.6 kg. Reference speed 9,500 r/min, limiting speed 13,000 r/min (bearing values)." }, { "q": "Why does C2207-KTN9-H307-E list a 30 mm shaft size when the bearing bore is 35 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 307 E has a tapered outside that engages the bearing's 35 mm tapered bore and a cylindrical bore that seats on the 30 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2207-KTN9-H307-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2207 KTN9 and the sleeve H 307 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2207-KTN9-H307-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2207-KTN9-H307-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 30 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2207-KTN9-H307-E", "SKF C 2207 KTN9 + H 307 E", "C 2207 KTN9 + H 307 E", "C 2207 KTN9", "H 307 E" ], "locale_variants": {}, "reference_speed_rpm": 9500, "limiting_speed_rpm": 13000, "max_rpm": 13000 }, { "sku": "C2208-KTN9-H308-E", "brand": "SKF", "manufacturer_designation": "SKF C 2208 KTN9 + H 308 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 35, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 90, "static_load_kN": 86.5, "fatigue_load_limit_kN": 10.2, "weight_g": 690, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2208 KTN9 and H 308 E must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C2208-KTN9-H308-E appears as bearing C 2208 KTN9 + adapter sleeve H 308 E: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 35 mm shaft.Numbering logic: the bearing half C 2208 KTN9 follows the CARB works numbering (type C, dimension series, 40 mm bore), while H 308 E identifies the sleeve execution for that bore; the combo C2208-KTN9-H308-E exists in the catalogue so that shaft (35 mm), housing (80 mm) and both components are specified with one order number. Adapter sleeve H 308 E: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 35 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. Selection arithmetic: the unit carries the ratings of its bearing — C 90 kN, C0 86.5 kN, Pu 10.2 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 35 mm shaft. Mounting C2208-KTN9-H308-E: clean the 35 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 80 mm H7, then drive the adapter sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve H 308 E onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Never set C2208-KTN9-H308-E by locknut torque or \"feel\": the adapter sleeve travel defines the clearance of the 40 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Keep the pair complete in stores: storing bearing C 2208 KTN9 and sleeve H 308 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "The 90/86.5 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2208 KTN9 + H 308 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2208-KTN9-H308-E?", "a": "The unit is CARB bearing C 2208 KTN9 on adapter sleeve H 308 E, fitting a 35 mm shaft (1.378 in), housing bore 80 mm, bearing width 23 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 90 kN, C0 86.5 kN, fatigue load limit Pu 10.2 kN, combined mass about 0.7 kg. Reference speed 8,000 r/min, limiting speed 11,000 r/min (bearing values)." }, { "q": "Why does C2208-KTN9-H308-E list a 35 mm shaft size when the bearing bore is 40 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 308 E has a tapered outside that engages the bearing's 40 mm tapered bore and a cylindrical bore that seats on the 35 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2208-KTN9-H308-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2208 KTN9 and the sleeve H 308 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2208-KTN9-H308-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2208-KTN9-H308-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 35 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2208-KTN9-H308-E", "SKF C 2208 KTN9 + H 308 E", "C 2208 KTN9 + H 308 E", "C 2208 KTN9", "H 308 E" ], "locale_variants": {}, "reference_speed_rpm": 8000, "limiting_speed_rpm": 11000, "max_rpm": 11000 }, { "sku": "C2209-KTN9-H309-E", "brand": "SKF", "manufacturer_designation": "SKF C 2209 KTN9 + H 309 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 40, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 93, "static_load_kN": 93, "fatigue_load_limit_kN": 10.8, "weight_g": 760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The locknut torque of H 309 E sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 45 mm CARB bearing and overheats the unit within hours. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2209 KTN9 and H 309 E must be checked against the application temperature before substitution.SKF C 2209 KTN9 + H 309 E is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 2209 KTN9, adapter sleeve H 309 E, fitting a 40 mm cylindrical shaft seat at 85 mm housing diameter.Numbering logic: the bearing half C 2209 KTN9 follows the CARB works numbering (type C, dimension series, 45 mm bore), while H 309 E identifies the sleeve execution for that bore; the combo C2209-KTN9-H309-E exists in the catalogue so that shaft (40 mm), housing (85 mm) and both components are specified with one order number. Adapter sleeve H 309 E: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 40 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. With a combined mass of 0.8 kg over the 40×85×23 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve H 309 E onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2209-KTN9-H309-E unit — replace the sleeve with the bearing.", "Protect the 40 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C2209-KTN9-H309-E.", "The 93/93 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2209 KTN9 + H 309 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2209-KTN9-H309-E?", "a": "The unit is CARB bearing C 2209 KTN9 on adapter sleeve H 309 E, fitting a 40 mm shaft (1.575 in), housing bore 85 mm, bearing width 23 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 93 kN, C0 93 kN, fatigue load limit Pu 10.8 kN, combined mass about 0.8 kg. Reference speed 7,500 r/min, limiting speed 11,000 r/min (bearing values)." }, { "q": "Why does C2209-KTN9-H309-E list a 40 mm shaft size when the bearing bore is 45 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 309 E has a tapered outside that engages the bearing's 45 mm tapered bore and a cylindrical bore that seats on the 40 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2209-KTN9-H309-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2209 KTN9 and the sleeve H 309 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2209-KTN9-H309-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2209-KTN9-H309-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 40 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2209-KTN9-H309-E", "SKF C 2209 KTN9 + H 309 E", "C 2209 KTN9 + H 309 E", "C 2209 KTN9", "H 309 E" ], "locale_variants": {}, "reference_speed_rpm": 7500, "limiting_speed_rpm": 11000, "max_rpm": 11000 }, { "sku": "C2210-KTN9-H310-E", "brand": "SKF", "manufacturer_designation": "SKF C 2210 KTN9 + H 310 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 45, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 98, "static_load_kN": 100, "fatigue_load_limit_kN": 11.8, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The C2210-KTN9-H310-E unit pairs the 50 mm-bore CARB toroidal roller bearing C 2210 KTN9 with adapter sleeve H 310 E, so it mounts on a plain cylindrical 45 mm shaft without a precision shoulder.Numbering logic: the bearing half C 2210 KTN9 follows the CARB works numbering (type C, dimension series, 50 mm bore), while H 310 E identifies the sleeve execution for that bore; the combo C2210-KTN9-H310-E exists in the catalogue so that shaft (45 mm), housing (90 mm) and both components are specified with one order number. Sleeve discipline: H 310 E and bearing C 2210 KTN9 are ground as a matched taper pair — the sleeve's seat diameter and the bearing's bore taper are manufactured together, which is why the catalogue lists the combination as one order number (C2210-KTN9-H310-E). Fatigue floor: Pu 11.8 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 2210 KTN9 bearing — the sleeve execution does not change the L10 arithmetic. The locknut torque of H 310 E sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 50 mm CARB bearing and overheats the unit within hours. Housing side of C2210-KTN9-H310-E is conventional: a 90 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 45 mm shaft.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 2210 KTN9 and sleeve H 310 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not run C2210-KTN9-H310-E as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Never set C2210-KTN9-H310-E by locknut torque or \"feel\": the adapter sleeve travel defines the clearance of the 50 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 98/100 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2210 KTN9 + H 310 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2210-KTN9-H310-E?", "a": "The unit is CARB bearing C 2210 KTN9 on adapter sleeve H 310 E, fitting a 45 mm shaft (1.772 in), housing bore 90 mm, bearing width 23 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 98 kN, C0 100 kN, fatigue load limit Pu 11.8 kN, combined mass about 0.8 kg. Reference speed 7,000 r/min, limiting speed 9,500 r/min (bearing values)." }, { "q": "Why does C2210-KTN9-H310-E list a 45 mm shaft size when the bearing bore is 50 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 310 E has a tapered outside that engages the bearing's 50 mm tapered bore and a cylindrical bore that seats on the 45 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2210-KTN9-H310-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2210 KTN9 and the sleeve H 310 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2210-KTN9-H310-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2210-KTN9-H310-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 45 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2210-KTN9-H310-E", "SKF C 2210 KTN9 + H 310 E", "C 2210 KTN9 + H 310 E", "C 2210 KTN9", "H 310 E" ], "locale_variants": {}, "reference_speed_rpm": 7000, "limiting_speed_rpm": 9500, "max_rpm": 9500 }, { "sku": "C2211-KTN9-H311-E", "brand": "SKF", "manufacturer_designation": "SKF C 2211 KTN9 + H 311 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 50, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 116, "static_load_kN": 114, "fatigue_load_limit_kN": 13.4, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Housing side of C2211-KTN9-H311-E is conventional: a 100 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 50 mm shaft.In SKF catalogue PUB BU/P1 17000, C2211-KTN9-H311-E appears as bearing C 2211 KTN9 + adapter sleeve H 311 E: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 50 mm shaft.Numbering logic: the bearing half C 2211 KTN9 follows the CARB works numbering (type C, dimension series, 55 mm bore), while H 311 E identifies the sleeve execution for that bore; the combo C2211-KTN9-H311-E exists in the catalogue so that shaft (50 mm), housing (100 mm) and both components are specified with one order number. Sleeve discipline: H 311 E and bearing C 2211 KTN9 are ground as a matched taper pair — the sleeve's seat diameter and the bearing's bore taper are manufactured together, which is why the catalogue lists the combination as one order number (C2211-KTN9-H311-E). Speed note: for C2211-KTN9-H311-E the CARB table lists 6,300 r/min reference and 9,000 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 50 mm seat. Dismounting: release the locknut of H 311 E, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 2211 KTN9 and sleeve H 311 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Never set C2211-KTN9-H311-E by locknut torque or \"feel\": the adapter sleeve travel defines the clearance of the 55 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2211-KTN9-H311-E unit — replace the sleeve with the bearing.", "The 116/114 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2211 KTN9 + H 311 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2211-KTN9-H311-E?", "a": "The unit is CARB bearing C 2211 KTN9 on adapter sleeve H 311 E, fitting a 50 mm shaft (1.969 in), housing bore 100 mm, bearing width 25 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 116 kN, C0 114 kN, fatigue load limit Pu 13.4 kN, combined mass about 1.1 kg. Reference speed 6,300 r/min, limiting speed 9,000 r/min (bearing values)." }, { "q": "Why does C2211-KTN9-H311-E list a 50 mm shaft size when the bearing bore is 55 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 311 E has a tapered outside that engages the bearing's 55 mm tapered bore and a cylindrical bore that seats on the 50 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2211-KTN9-H311-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2211 KTN9 and the sleeve H 311 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2211-KTN9-H311-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2211-KTN9-H311-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 50 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2211-KTN9-H311-E", "SKF C 2211 KTN9 + H 311 E", "C 2211 KTN9 + H 311 E", "C 2211 KTN9", "H 311 E" ], "locale_variants": {}, "reference_speed_rpm": 6300, "limiting_speed_rpm": 9000, "max_rpm": 9000 }, { "sku": "C2212-KTN9-H312-E", "brand": "SKF", "manufacturer_designation": "SKF C 2212 KTN9 + H 312 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 55, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 143, "static_load_kN": 156, "fatigue_load_limit_kN": 18.3, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Mounting C2212-KTN9-H312-E: clean the 55 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 110 mm H7, then drive the adapter sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Housing side of C2212-KTN9-H312-E is conventional: a 110 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 55 mm shaft.SKF C 2212 KTN9 + H 312 E is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 2212 KTN9, adapter sleeve H 312 E, fitting a 55 mm cylindrical shaft seat at 110 mm housing diameter.Numbering logic: the bearing half C 2212 KTN9 follows the CARB works numbering (type C, dimension series, 60 mm bore), while H 312 E identifies the sleeve execution for that bore; the combo C2212-KTN9-H312-E exists in the catalogue so that shaft (55 mm), housing (110 mm) and both components are specified with one order number. Sleeve discipline: H 312 E and bearing C 2212 KTN9 are ground as a matched taper pair — the sleeve's seat diameter and the bearing's bore taper are manufactured together, which is why the catalogue lists the combination as one order number (C2212-KTN9-H312-E). The C0/C balance of about 1.09 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the adapter sleeve adds the plain-shaft mounting ability, not thrust capability.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 2212 KTN9 and sleeve H 312 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2212-KTN9-H312-E unit — replace the sleeve with the bearing.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2212-KTN9-H312-E and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 143/156 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2212 KTN9 + H 312 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2212-KTN9-H312-E?", "a": "The unit is CARB bearing C 2212 KTN9 on adapter sleeve H 312 E, fitting a 55 mm shaft (2.165 in), housing bore 110 mm, bearing width 28 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 143 kN, C0 156 kN, fatigue load limit Pu 18.3 kN, combined mass about 1.4 kg. Reference speed 5,600 r/min, limiting speed 7,500 r/min (bearing values)." }, { "q": "Why does C2212-KTN9-H312-E list a 55 mm shaft size when the bearing bore is 60 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 312 E has a tapered outside that engages the bearing's 60 mm tapered bore and a cylindrical bore that seats on the 55 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2212-KTN9-H312-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2212 KTN9 and the sleeve H 312 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2212-KTN9-H312-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2212-KTN9-H312-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 55 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2212-KTN9-H312-E", "SKF C 2212 KTN9 + H 312 E", "C 2212 KTN9 + H 312 E", "C 2212 KTN9", "H 312 E" ], "locale_variants": {}, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "max_rpm": 7500 }, { "sku": "C2213-KTN9-H313-E", "brand": "SKF", "manufacturer_designation": "SKF C 2213 KTN9 + H 313 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 60, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 180, "static_load_kN": 180, "fatigue_load_limit_kN": 21.2, "weight_g": 1800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Fatigue floor: Pu 21.2 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 2213 KTN9 bearing — the sleeve execution does not change the L10 arithmetic. The locknut torque of H 313 E sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 65 mm CARB bearing and overheats the unit within hours. Housing side of C2213-KTN9-H313-E is conventional: a 120 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 60 mm shaft.Ordering C2213-KTN9-H313-E buys one matched assembly — CARB bearing C 2213 KTN9 on adapter sleeve H 313 E — rather than a bearing and a sleeve ordered separately for a 60 mm shaft.Numbering logic: the bearing half C 2213 KTN9 follows the CARB works numbering (type C, dimension series, 65 mm bore), while H 313 E identifies the sleeve execution for that bore; the combo C2213-KTN9-H313-E exists in the catalogue so that shaft (60 mm), housing (120 mm) and both components are specified with one order number. Sleeve discipline: H 313 E and bearing C 2213 KTN9 are ground as a matched taper pair — the sleeve's seat diameter and the bearing's bore taper are manufactured together, which is why the catalogue lists the combination as one order number (C2213-KTN9-H313-E).", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 2213 KTN9 and sleeve H 313 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2213-KTN9-H313-E and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Keep the pair complete in stores: storing bearing C 2213 KTN9 and sleeve H 313 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "The 180/180 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2213 KTN9 + H 313 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2213-KTN9-H313-E?", "a": "The unit is CARB bearing C 2213 KTN9 on adapter sleeve H 313 E, fitting a 60 mm shaft (2.362 in), housing bore 120 mm, bearing width 31 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 180 kN, C0 180 kN, fatigue load limit Pu 21.2 kN, combined mass about 1.8 kg. Reference speed 5,300 r/min, limiting speed 7,500 r/min (bearing values)." }, { "q": "Why does C2213-KTN9-H313-E list a 60 mm shaft size when the bearing bore is 65 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 313 E has a tapered outside that engages the bearing's 65 mm tapered bore and a cylindrical bore that seats on the 60 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2213-KTN9-H313-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2213 KTN9 and the sleeve H 313 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2213-KTN9-H313-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2213-KTN9-H313-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 60 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2213", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2213-KTN9-H313-E", "SKF C 2213 KTN9 + H 313 E", "C 2213 KTN9 + H 313 E", "C 2213 KTN9", "H 313 E" ], "locale_variants": {}, "reference_speed_rpm": 5300, "limiting_speed_rpm": 7500, "max_rpm": 7500 }, { "sku": "C2215-K-H315-E", "brand": "SKF", "manufacturer_designation": "SKF C 2215 K + H 315 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 65, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 196, "static_load_kN": 208, "fatigue_load_limit_kN": 24, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Fatigue floor: Pu 24 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 2215 K bearing — the sleeve execution does not change the L10 arithmetic. The locknut torque of H 315 E sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 75 mm CARB bearing and overheats the unit within hours. Spare-parts note: order C2215-K-H315-E as the unit; a bare C 2215 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.In SKF catalogue PUB BU/P1 17000, C2215-K-H315-E appears as bearing C 2215 K + adapter sleeve H 315 E: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 65 mm shaft.On the SKF nameplate, C2215-K-H315-E reads as two catalogued components: the CARB bearing C 2215 K with its 75 mm tapered (K) bore, and the adapter sleeve H 315 E whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 65 mm shaft size. Sleeve discipline: H 315 E and bearing C 2215 K are ground as a matched taper pair — the sleeve's seat diameter and the bearing's bore taper are manufactured together, which is why the catalogue lists the combination as one order number (C2215-K-H315-E).", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 2215 K and sleeve H 315 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not run C2215-K-H315-E as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Sleeve and bearing are a matched taper pair: never fit sleeve H 315 E onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 196/208 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2215 K + H 315 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2215-K-H315-E?", "a": "The unit is CARB bearing C 2215 K on adapter sleeve H 315 E, fitting a 65 mm shaft (2.559 in), housing bore 130 mm, bearing width 31 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 196 kN, C0 208 kN, fatigue load limit Pu 24 kN, combined mass about 2.3 kg. Reference speed 4,800 r/min, limiting speed 6,700 r/min (bearing values)." }, { "q": "Why does C2215-K-H315-E list a 65 mm shaft size when the bearing bore is 75 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 315 E has a tapered outside that engages the bearing's 75 mm tapered bore and a cylindrical bore that seats on the 65 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2215-K-H315-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2215 K and the sleeve H 315 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2215-K-H315-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2215-K-H315-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 65 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2215-K-H315-E", "SKF C 2215 K + H 315 E", "C 2215 K + H 315 E", "C 2215 K", "H 315 E" ], "locale_variants": {}, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6700, "max_rpm": 6700 }, { "sku": "C2216-K-H316-E", "brand": "SKF", "manufacturer_designation": "SKF C 2216 K + H 316 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 70, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 220, "static_load_kN": 250, "fatigue_load_limit_kN": 28.5, "weight_g": 2900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2216 K and H 316 E must be checked against the application temperature before substitution.The C2216-K-H316-E unit pairs the 80 mm-bore CARB toroidal roller bearing C 2216 K with adapter sleeve H 316 E, so it mounts on a plain cylindrical 70 mm shaft without a precision shoulder.On the SKF nameplate, C2216-K-H316-E reads as two catalogued components: the CARB bearing C 2216 K with its 80 mm tapered (K) bore, and the adapter sleeve H 316 E whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 70 mm shaft size. OH execution note: H 316 E is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 70 mm shaft seat during overhauls. With a combined mass of 2.9 kg over the 70×140×33 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Dismounting: release the locknut of H 316 E, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2216-K-H316-E unit — replace the sleeve with the bearing.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2216-K-H316-E unit — replace the sleeve with the bearing.", "Sleeve and bearing are a matched taper pair: never fit sleeve H 316 E onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 220/250 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2216 K + H 316 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2216-K-H316-E?", "a": "The unit is CARB bearing C 2216 K on adapter sleeve H 316 E, fitting a 70 mm shaft (2.756 in), housing bore 140 mm, bearing width 33 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 220 kN, C0 250 kN, fatigue load limit Pu 28.5 kN, combined mass about 2.9 kg. Reference speed 4,300 r/min, limiting speed 6,000 r/min (bearing values)." }, { "q": "Why does C2216-K-H316-E list a 70 mm shaft size when the bearing bore is 80 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 316 E has a tapered outside that engages the bearing's 80 mm tapered bore and a cylindrical bore that seats on the 70 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2216-K-H316-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2216 K and the sleeve H 316 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2216-K-H316-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2216-K-H316-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 70 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2216-K-H316-E", "SKF C 2216 K + H 316 E", "C 2216 K + H 316 E", "C 2216 K", "H 316 E" ], "locale_variants": {}, "reference_speed_rpm": 4300, "limiting_speed_rpm": 6000, "max_rpm": 6000 }, { "sku": "C2217-K-H317-E", "brand": "SKF", "manufacturer_designation": "SKF C 2217 K + H 317 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 75, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 275, "static_load_kN": 320, "fatigue_load_limit_kN": 35.5, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Reading the designation: C 2217 K is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the adapter sleeve H 317 E carries the tapered bore seat on a 75 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore. The H 317 E execution mounts the 85 mm K-bore bearing with a controlled squeeze on the 75 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel. With a combined mass of 3.7 kg over the 75×150×36 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. The locknut torque of H 317 E sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 85 mm CARB bearing and overheats the unit within hours. Housing side of C2217-K-H317-E is conventional: a 150 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 75 mm shaft.SKF C 2217 K + H 317 E is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 2217 K, adapter sleeve H 317 E, fitting a 75 mm cylindrical shaft seat at 150 mm housing diameter.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve H 317 E onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Keep the pair complete in stores: storing bearing C 2217 K and sleeve H 317 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Never set C2217-K-H317-E by locknut torque or \"feel\": the adapter sleeve travel defines the clearance of the 85 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 275/320 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2217 K + H 317 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2217-K-H317-E?", "a": "The unit is CARB bearing C 2217 K on adapter sleeve H 317 E, fitting a 75 mm shaft (2.953 in), housing bore 150 mm, bearing width 36 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 275 kN, C0 320 kN, fatigue load limit Pu 35.5 kN, combined mass about 3.7 kg. Reference speed 4,000 r/min, limiting speed 5,600 r/min (bearing values)." }, { "q": "Why does C2217-K-H317-E list a 75 mm shaft size when the bearing bore is 85 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 317 E has a tapered outside that engages the bearing's 85 mm tapered bore and a cylindrical bore that seats on the 75 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2217-K-H317-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2217 K and the sleeve H 317 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2217-K-H317-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2217-K-H317-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 75 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2217-K-H317-E", "SKF C 2217 K + H 317 E", "C 2217 K + H 317 E", "C 2217 K", "H 317 E" ], "locale_variants": {}, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5600, "max_rpm": 5600 }, { "sku": "C2218-K-H318-E", "brand": "SKF", "manufacturer_designation": "SKF C 2218 K + H 318 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 80, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 380, "fatigue_load_limit_kN": 41.5, "weight_g": 4500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The locknut torque of H 318 E sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 90 mm CARB bearing and overheats the unit within hours. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2218 K and H 318 E must be checked against the application temperature before substitution.C2218-K-H318-E is a complete SKF mounting unit: the CARB toroidal roller bearing C 2218 K supplied on its adapter sleeve H 318 E, listed in SKF catalogue PUB BU/P1 17000 for a 80 mm shaft seat.Numbering logic: the bearing half C 2218 K follows the CARB works numbering (type C, dimension series, 90 mm bore), while H 318 E identifies the sleeve execution for that bore; the combo C2218-K-H318-E exists in the catalogue so that shaft (80 mm), housing (160 mm) and both components are specified with one order number. OH execution note: H 318 E is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 80 mm shaft seat during overhauls. With a combined mass of 4.5 kg over the 80×160×40 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve H 318 E onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2218-K-H318-E and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Do not run C2218-K-H318-E as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 325/380 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2218 K + H 318 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2218-K-H318-E?", "a": "The unit is CARB bearing C 2218 K on adapter sleeve H 318 E, fitting a 80 mm shaft (3.15 in), housing bore 160 mm, bearing width 40 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 325 kN, C0 380 kN, fatigue load limit Pu 41.5 kN, combined mass about 4.5 kg. Reference speed 3,800 r/min, limiting speed 5,300 r/min (bearing values)." }, { "q": "Why does C2218-K-H318-E list a 80 mm shaft size when the bearing bore is 90 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 318 E has a tapered outside that engages the bearing's 90 mm tapered bore and a cylindrical bore that seats on the 80 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2218-K-H318-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2218 K and the sleeve H 318 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2218-K-H318-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2218-K-H318-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 80 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2218-K-H318-E", "SKF C 2218 K + H 318 E", "C 2218 K + H 318 E", "C 2218 K", "H 318 E" ], "locale_variants": {}, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "max_rpm": 5300 }, { "sku": "C2319-K-H2319", "brand": "SKF", "manufacturer_designation": "SKF C 2319 K + H 2319", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 85, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 610, "static_load_kN": 695, "fatigue_load_limit_kN": 73.5, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Numbering logic: the bearing half C 2319 K follows the CARB works numbering (type C, dimension series, 95 mm bore), while H 2319 identifies the sleeve execution for that bore; the combo C2319-K-H2319 exists in the catalogue so that shaft (85 mm), housing (200 mm) and both components are specified with one order number. What the H execution changes: an adapter sleeve clamps the 95 mm tapered bore onto a plain 85 mm shaft, so the housing-side location work happens at the sleeve locknut — no machined shaft shoulder is needed at the bearing seat. Dividing C 610 kN by the 95 mm bore gives 6.42 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 85 mm seat is fixed and the life requirement is not. Dismounting: release the locknut of H 2319, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Spare-parts note: order C2319-K-H2319 as the unit; a bare C 2319 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.The C2319-K-H2319 unit pairs the 95 mm-bore CARB toroidal roller bearing C 2319 K with adapter sleeve H 2319, so it mounts on a plain cylindrical 85 mm shaft without a precision shoulder.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2319-K-H2319 unit — replace the sleeve with the bearing.", "Protect the 85 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C2319-K-H2319.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2319-K-H2319 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 610/695 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2319 K + H 2319 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2319-K-H2319?", "a": "The unit is CARB bearing C 2319 K on adapter sleeve H 2319, fitting a 85 mm shaft (3.346 in), housing bore 200 mm, bearing width 67 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 610 kN, C0 695 kN, fatigue load limit Pu 73.5 kN, combined mass about 11.5 kg. Reference speed 2,800 r/min, limiting speed 4,000 r/min (bearing values)." }, { "q": "Why does C2319-K-H2319 list a 85 mm shaft size when the bearing bore is 95 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 2319 has a tapered outside that engages the bearing's 95 mm tapered bore and a cylindrical bore that seats on the 85 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2319-K-H2319 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2319 K and the sleeve H 2319 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2319-K-H2319 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2319-K-H2319 set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 85 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2319-K-H2319", "SKF C 2319 K + H 2319", "C 2319 K + H 2319", "C 2319 K", "H 2319" ], "locale_variants": {}, "reference_speed_rpm": 2800, "limiting_speed_rpm": 4000, "max_rpm": 4000 }, { "sku": "C2220-K-H320-E", "brand": "SKF", "manufacturer_designation": "SKF C 2220 K + H 320 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 90, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 415, "static_load_kN": 465, "fatigue_load_limit_kN": 49, "weight_g": 6300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C2220-K-H320-E appears as bearing C 2220 K + adapter sleeve H 320 E: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 90 mm shaft.The code breaks into bearing C 2220 K and adapter sleeve H 320 E: C marks the CARB type, the digit group the 100 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C2220-K-H320-E. OH execution note: H 320 E is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 90 mm shaft seat during overhauls. The C0/C balance of about 1.12 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the adapter sleeve adds the plain-shaft mounting ability, not thrust capability. The locknut torque of H 320 E sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 100 mm CARB bearing and overheats the unit within hours. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2220 K and H 320 E must be checked against the application temperature before substitution.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve H 320 E onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2220-K-H320-E unit — replace the sleeve with the bearing.", "Keep the pair complete in stores: storing bearing C 2220 K and sleeve H 320 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "The 415/465 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2220 K + H 320 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2220-K-H320-E?", "a": "The unit is CARB bearing C 2220 K on adapter sleeve H 320 E, fitting a 90 mm shaft (3.543 in), housing bore 180 mm, bearing width 46 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 415 kN, C0 465 kN, fatigue load limit Pu 49 kN, combined mass about 6.3 kg. Reference speed 3,600 r/min, limiting speed 4,800 r/min (bearing values)." }, { "q": "Why does C2220-K-H320-E list a 90 mm shaft size when the bearing bore is 100 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 320 E has a tapered outside that engages the bearing's 100 mm tapered bore and a cylindrical bore that seats on the 90 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2220-K-H320-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2220 K and the sleeve H 320 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2220-K-H320-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2220-K-H320-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 90 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2220-K-H320-E", "SKF C 2220 K + H 320 E", "C 2220 K + H 320 E", "C 2220 K", "H 320 E" ], "locale_variants": {}, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "max_rpm": 4800 }, { "sku": "C2222-K-H322-E", "brand": "SKF", "manufacturer_designation": "SKF C 2222 K + H 322 E", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 100, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 530, "static_load_kN": 620, "fatigue_load_limit_kN": 64, "weight_g": 8800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Housing side of C2222-K-H322-E is conventional: a 200 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 100 mm shaft.The C2222-K-H322-E unit pairs the 110 mm-bore CARB toroidal roller bearing C 2222 K with adapter sleeve H 322 E, so it mounts on a plain cylindrical 100 mm shaft without a precision shoulder.On the SKF nameplate, C2222-K-H322-E reads as two catalogued components: the CARB bearing C 2222 K with its 110 mm tapered (K) bore, and the adapter sleeve H 322 E whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 100 mm shaft size. The H 322 E execution mounts the 110 mm K-bore bearing with a controlled squeeze on the 100 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel. Dividing C 530 kN by the 110 mm bore gives 4.82 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 100 mm seat is fixed and the life requirement is not. Mounting C2222-K-H322-E: clean the 100 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 200 mm H7, then drive the adapter sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2222-K-H322-E and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Never set C2222-K-H322-E by locknut torque or \"feel\": the adapter sleeve travel defines the clearance of the 110 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Keep the pair complete in stores: storing bearing C 2222 K and sleeve H 322 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "The 530/620 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2222 K + H 322 E when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2222-K-H322-E?", "a": "The unit is CARB bearing C 2222 K on adapter sleeve H 322 E, fitting a 100 mm shaft (3.937 in), housing bore 200 mm, bearing width 53 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 530 kN, C0 620 kN, fatigue load limit Pu 64 kN, combined mass about 8.8 kg. Reference speed 3,200 r/min, limiting speed 4,300 r/min (bearing values)." }, { "q": "Why does C2222-K-H322-E list a 100 mm shaft size when the bearing bore is 110 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 322 E has a tapered outside that engages the bearing's 110 mm tapered bore and a cylindrical bore that seats on the 100 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2222-K-H322-E a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2222 K and the sleeve H 322 E separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2222-K-H322-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2222-K-H322-E set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 100 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2222-K-H322-E", "SKF C 2222 K + H 322 E", "C 2222 K + H 322 E", "C 2222 K", "H 322 E" ], "locale_variants": {}, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "max_rpm": 4300 }, { "sku": "C3224-K-H2324-L", "brand": "SKF", "manufacturer_designation": "SKF C 3224 K + H 2324 L", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 110, "D_mm": 215, "B_mm": 76, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 750, "static_load_kN": 980, "fatigue_load_limit_kN": 98, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF C 3224 K + H 2324 L is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 3224 K, adapter sleeve H 2324 L, fitting a 110 mm cylindrical shaft seat at 215 mm housing diameter.On the SKF nameplate, C3224-K-H2324-L reads as two catalogued components: the CARB bearing C 3224 K with its 120 mm tapered (K) bore, and the adapter sleeve H 2324 L whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 110 mm shaft size. The H 2324 L execution mounts the 120 mm K-bore bearing with a controlled squeeze on the 110 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel. Selection arithmetic: the unit carries the ratings of its bearing — C 750 kN, C0 980 kN, Pu 98 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 110 mm shaft. Dismounting: release the locknut of H 2324 L, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Spare-parts note: order C3224-K-H2324-L as the unit; a bare C 3224 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Do not run C3224-K-H2324-L as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3224-K-H2324-L and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3224-K-H2324-L and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 750/980 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3224 K + H 2324 L when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3224-K-H2324-L?", "a": "The unit is CARB bearing C 3224 K on adapter sleeve H 2324 L, fitting a 110 mm shaft (4.331 in), housing bore 215 mm, bearing width 76 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 750 kN, C0 980 kN, fatigue load limit Pu 98 kN, combined mass about 14.0 kg. Reference speed 2,400 r/min, limiting speed 3,200 r/min (bearing values)." }, { "q": "Why does C3224-K-H2324-L list a 110 mm shaft size when the bearing bore is 120 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 2324 L has a tapered outside that engages the bearing's 120 mm tapered bore and a cylindrical bore that seats on the 110 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3224-K-H2324-L a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3224 K and the sleeve H 2324 L separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3224-K-H2324-L as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3224-K-H2324-L set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 110 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3224", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3224-K-H2324-L", "SKF C 3224 K + H 2324 L", "C 3224 K + H 2324 L", "C 3224 K", "H 2324 L" ], "locale_variants": {}, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "max_rpm": 3200 }, { "sku": "C2226-K-H3126-L", "brand": "SKF", "manufacturer_designation": "SKF C 2226 K + H 3126 L", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 115, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 735, "static_load_kN": 930, "fatigue_load_limit_kN": 91.5, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Dismounting: release the locknut of H 3126 L, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2226 K and H 3126 L must be checked against the application temperature before substitution.C2226-K-H3126-L is a complete SKF mounting unit: the CARB toroidal roller bearing C 2226 K supplied on its adapter sleeve H 3126 L, listed in SKF catalogue PUB BU/P1 17000 for a 115 mm shaft seat.On the SKF nameplate, C2226-K-H3126-L reads as two catalogued components: the CARB bearing C 2226 K with its 130 mm tapered (K) bore, and the adapter sleeve H 3126 L whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 115 mm shaft size. OH execution note: H 3126 L is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 115 mm shaft seat during overhauls. Speed note: for C2226-K-H3126-L the CARB table lists 2,800 r/min reference and 3,800 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 115 mm seat.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 2226 K and sleeve H 3126 L on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2226-K-H3126-L unit — replace the sleeve with the bearing.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2226-K-H3126-L unit — replace the sleeve with the bearing.", "The 735/930 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2226 K + H 3126 L when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2226-K-H3126-L?", "a": "The unit is CARB bearing C 2226 K on adapter sleeve H 3126 L, fitting a 115 mm shaft (4.528 in), housing bore 230 mm, bearing width 64 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 735 kN, C0 930 kN, fatigue load limit Pu 91.5 kN, combined mass about 14.0 kg. Reference speed 2,800 r/min, limiting speed 3,800 r/min (bearing values)." }, { "q": "Why does C2226-K-H3126-L list a 115 mm shaft size when the bearing bore is 130 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 3126 L has a tapered outside that engages the bearing's 130 mm tapered bore and a cylindrical bore that seats on the 115 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2226-K-H3126-L a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2226 K and the sleeve H 3126 L separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2226-K-H3126-L as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2226-K-H3126-L set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 115 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2226", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2226-K-H3126-L", "SKF C 2226 K + H 3126 L", "C 2226 K + H 3126 L", "C 2226 K", "H 3126 L" ], "locale_variants": {}, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "max_rpm": 3800 }, { "sku": "C2228-K-H3128-L", "brand": "SKF", "manufacturer_designation": "SKF C 2228 K + H 3128 L", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 125, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 830, "static_load_kN": 1060, "fatigue_load_limit_kN": 102, "weight_g": 17500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Sleeve discipline: H 3128 L and bearing C 2228 K are ground as a matched taper pair — the sleeve's seat diameter and the bearing's bore taper are manufactured together, which is why the catalogue lists the combination as one order number (C2228-K-H3128-L). The C0/C balance of about 1.28 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the adapter sleeve adds the plain-shaft mounting ability, not thrust capability. Dismounting: release the locknut of H 3128 L, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Housing side of C2228-K-H3128-L is conventional: a 250 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 125 mm shaft.In SKF catalogue PUB BU/P1 17000, C2228-K-H3128-L appears as bearing C 2228 K + adapter sleeve H 3128 L: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 125 mm shaft.Digit by digit, C2228-K-H3128-L = CARB bearing C 2228 K (140 mm bore, 250 mm OD, 68 mm width) + adapter sleeve H 3128 L for the 125 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Do not run C2228-K-H3128-L as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Protect the 125 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C2228-K-H3128-L.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2228-K-H3128-L and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 830/1060 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2228 K + H 3128 L when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2228-K-H3128-L?", "a": "The unit is CARB bearing C 2228 K on adapter sleeve H 3128 L, fitting a 125 mm shaft (4.921 in), housing bore 250 mm, bearing width 68 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 830 kN, C0 1060 kN, fatigue load limit Pu 102 kN, combined mass about 17.5 kg. Reference speed 2,400 r/min, limiting speed 3,200 r/min (bearing values)." }, { "q": "Why does C2228-K-H3128-L list a 125 mm shaft size when the bearing bore is 140 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 3128 L has a tapered outside that engages the bearing's 140 mm tapered bore and a cylindrical bore that seats on the 125 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2228-K-H3128-L a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2228 K and the sleeve H 3128 L separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2228-K-H3128-L as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2228-K-H3128-L set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 125 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2228-K-H3128-L", "SKF C 2228 K + H 3128 L", "C 2228 K + H 3128 L", "C 2228 K", "H 3128 L" ], "locale_variants": {}, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "max_rpm": 3200 }, { "sku": "C3030-KV-H3030", "brand": "SKF", "manufacturer_designation": "SKF C 3030 KV + H 3030", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 135, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 585, "static_load_kN": 960, "fatigue_load_limit_kN": 93, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Digit by digit, C3030-KV-H3030 = CARB bearing C 3030 KV (150 mm bore, 225 mm OD, 56 mm width) + adapter sleeve H 3030 for the 135 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. OH execution note: H 3030 is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 135 mm shaft seat during overhauls. Fatigue floor: Pu 93 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3030 KV bearing — the sleeve execution does not change the L10 arithmetic. The locknut torque of H 3030 sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 150 mm CARB bearing and overheats the unit within hours. Housing side of C3030-KV-H3030 is conventional: a 225 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 135 mm shaft.In SKF catalogue PUB BU/P1 17000, C3030-KV-H3030 appears as bearing C 3030 KV + adapter sleeve H 3030: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 135 mm shaft.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Do not run C3030-KV-H3030 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Sleeve and bearing are a matched taper pair: never fit sleeve H 3030 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3030-KV-H3030 unit — replace the sleeve with the bearing.", "The 585/960 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3030 KV + H 3030 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3030-KV-H3030?", "a": "The unit is CARB bearing C 3030 KV on adapter sleeve H 3030, fitting a 135 mm shaft (5.315 in), housing bore 225 mm, bearing width 56 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 585 kN, C0 960 kN, fatigue load limit Pu 93 kN, combined mass about 11.5 kg. The catalogue lists no speed ratings for this size class — permissible speed follows the application heat balance." }, { "q": "Why does C3030-KV-H3030 list a 135 mm shaft size when the bearing bore is 150 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 3030 has a tapered outside that engages the bearing's 150 mm tapered bore and a cylindrical bore that seats on the 135 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3030-KV-H3030 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3030 KV and the sleeve H 3030 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3030-KV-H3030 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3030-KV-H3030 set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 135 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3030-KV-H3030", "SKF C 3030 KV + H 3030", "C 3030 KV + H 3030", "C 3030 KV", "H 3030" ], "locale_variants": {}, "limiting_speed_rpm": 1000, "max_rpm": 1000 }, { "sku": "C3132-K-H3132-L", "brand": "SKF", "manufacturer_designation": "SKF C 3132 K + H 3132 L", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 140, "D_mm": 270, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1000, "static_load_kN": 1400, "fatigue_load_limit_kN": 129, "weight_g": 27000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " What the H execution changes: an adapter sleeve clamps the 160 mm tapered bore onto a plain 140 mm shaft, so the housing-side location work happens at the sleeve locknut — no machined shaft shoulder is needed at the bearing seat. Selection arithmetic: the unit carries the ratings of its bearing — C 1000 kN, C0 1400 kN, Pu 129 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 140 mm shaft. Dismounting: release the locknut of H 3132 L, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Spare-parts note: order C3132-K-H3132-L as the unit; a bare C 3132 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.In SKF catalogue PUB BU/P1 17000, C3132-K-H3132-L appears as bearing C 3132 K + adapter sleeve H 3132 L: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 140 mm shaft.On the SKF nameplate, C3132-K-H3132-L reads as two catalogued components: the CARB bearing C 3132 K with its 160 mm tapered (K) bore, and the adapter sleeve H 3132 L whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 140 mm shaft size.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Do not run C3132-K-H3132-L as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C3132-K-H3132-L as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3132-K-H3132-L unit — replace the sleeve with the bearing.", "The 1000/1400 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3132 K + H 3132 L when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3132-K-H3132-L?", "a": "The unit is CARB bearing C 3132 K on adapter sleeve H 3132 L, fitting a 140 mm shaft (5.512 in), housing bore 270 mm, bearing width 86 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1000 kN, C0 1400 kN, fatigue load limit Pu 129 kN, combined mass about 27.0 kg. Reference speed 1,900 r/min, limiting speed 2,600 r/min (bearing values)." }, { "q": "Why does C3132-K-H3132-L list a 140 mm shaft size when the bearing bore is 160 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 3132 L has a tapered outside that engages the bearing's 160 mm tapered bore and a cylindrical bore that seats on the 140 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3132-K-H3132-L a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3132 K and the sleeve H 3132 L separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3132-K-H3132-L as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3132-K-H3132-L set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 140 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3132", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3132-K-H3132-L", "SKF C 3132 K + H 3132 L", "C 3132 K + H 3132 L", "C 3132 K", "H 3132 L" ], "locale_variants": {}, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "max_rpm": 2600 }, { "sku": "C2234-K-H3134-L", "brand": "SKF", "manufacturer_designation": "SKF C 2234 K + H 3134 L", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 150, "D_mm": 310, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1270, "static_load_kN": 1630, "fatigue_load_limit_kN": 146, "weight_g": 35000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " What the H execution changes: an adapter sleeve clamps the 170 mm tapered bore onto a plain 150 mm shaft, so the housing-side location work happens at the sleeve locknut — no machined shaft shoulder is needed at the bearing seat. Dividing C 1270 kN by the 170 mm bore gives 7.47 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 150 mm seat is fixed and the life requirement is not. Mounting C2234-K-H3134-L: clean the 150 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 310 mm H7, then drive the adapter sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Spare-parts note: order C2234-K-H3134-L as the unit; a bare C 2234 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.The C2234-K-H3134-L unit pairs the 170 mm-bore CARB toroidal roller bearing C 2234 K with adapter sleeve H 3134 L, so it mounts on a plain cylindrical 150 mm shaft without a precision shoulder.Digit by digit, C2234-K-H3134-L = CARB bearing C 2234 K (170 mm bore, 310 mm OD, 86 mm width) + adapter sleeve H 3134 L for the 150 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 2234 K and sleeve H 3134 L on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Protect the 150 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C2234-K-H3134-L.", "Do not run C2234-K-H3134-L as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 1270/1630 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2234 K + H 3134 L when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2234-K-H3134-L?", "a": "The unit is CARB bearing C 2234 K on adapter sleeve H 3134 L, fitting a 150 mm shaft (5.906 in), housing bore 310 mm, bearing width 86 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1270 kN, C0 1630 kN, fatigue load limit Pu 146 kN, combined mass about 35.0 kg. Reference speed 1,900 r/min, limiting speed 2,600 r/min (bearing values)." }, { "q": "Why does C2234-K-H3134-L list a 150 mm shaft size when the bearing bore is 170 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 3134 L has a tapered outside that engages the bearing's 170 mm tapered bore and a cylindrical bore that seats on the 150 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2234-K-H3134-L a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2234 K and the sleeve H 3134 L separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2234-K-H3134-L as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2234-K-H3134-L set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 150 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C2234", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2234-K-H3134-L", "SKF C 2234 K + H 3134 L", "C 2234 K + H 3134 L", "C 2234 K", "H 3134 L" ], "locale_variants": {}, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "max_rpm": 2600 }, { "sku": "C3036-K-H3036", "brand": "SKF", "manufacturer_designation": "SKF C 3036 K + H 3036", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 160, "D_mm": 280, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 880, "static_load_kN": 1340, "fatigue_load_limit_kN": 122, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The code breaks into bearing C 3036 K and adapter sleeve H 3036: C marks the CARB type, the digit group the 180 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C3036-K-H3036. OH execution note: H 3036 is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 160 mm shaft seat during overhauls. With a combined mass of 23.0 kg over the 160×280×74 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. The locknut torque of H 3036 sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 180 mm CARB bearing and overheats the unit within hours. Spare-parts note: order C3036-K-H3036 as the unit; a bare C 3036 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.C3036-K-H3036 is a complete SKF mounting unit: the CARB toroidal roller bearing C 3036 K supplied on its adapter sleeve H 3036, listed in SKF catalogue PUB BU/P1 17000 for a 160 mm shaft seat.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Protect the 160 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3036-K-H3036.", "Sleeve and bearing are a matched taper pair: never fit sleeve H 3036 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3036-K-H3036 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 880/1340 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3036 K + H 3036 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3036-K-H3036?", "a": "The unit is CARB bearing C 3036 K on adapter sleeve H 3036, fitting a 160 mm shaft (6.299 in), housing bore 280 mm, bearing width 74 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 880 kN, C0 1340 kN, fatigue load limit Pu 122 kN, combined mass about 23.0 kg. Reference speed 2,000 r/min, limiting speed 2,600 r/min (bearing values)." }, { "q": "Why does C3036-K-H3036 list a 160 mm shaft size when the bearing bore is 180 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 3036 has a tapered outside that engages the bearing's 180 mm tapered bore and a cylindrical bore that seats on the 160 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3036-K-H3036 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3036 K and the sleeve H 3036 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3036-K-H3036 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3036-K-H3036 set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 160 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3036", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3036-K-H3036", "SKF C 3036 K + H 3036", "C 3036 K + H 3036", "C 3036 K", "H 3036" ], "locale_variants": {}, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "max_rpm": 2600 }, { "sku": "C3038-K-H3038", "brand": "SKF", "manufacturer_designation": "SKF C 3038 K + H 3038", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 170, "D_mm": 290, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 930, "static_load_kN": 1460, "fatigue_load_limit_kN": 132, "weight_g": 24000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Spare-parts note: order C3038-K-H3038 as the unit; a bare C 3038 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.In SKF catalogue PUB BU/P1 17000, C3038-K-H3038 appears as bearing C 3038 K + adapter sleeve H 3038: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 170 mm shaft.Digit by digit, C3038-K-H3038 = CARB bearing C 3038 K (190 mm bore, 290 mm OD, 75 mm width) + adapter sleeve H 3038 for the 170 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. The H 3038 execution mounts the 190 mm K-bore bearing with a controlled squeeze on the 170 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel. Selection arithmetic: the unit carries the ratings of its bearing — C 930 kN, C0 1460 kN, Pu 132 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 170 mm shaft. The locknut torque of H 3038 sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 190 mm CARB bearing and overheats the unit within hours.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Protect the 170 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3038-K-H3038.", "Protect the 170 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3038-K-H3038.", "Sleeve and bearing are a matched taper pair: never fit sleeve H 3038 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 930/1460 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3038 K + H 3038 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3038-K-H3038?", "a": "The unit is CARB bearing C 3038 K on adapter sleeve H 3038, fitting a 170 mm shaft (6.693 in), housing bore 290 mm, bearing width 75 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 930 kN, C0 1460 kN, fatigue load limit Pu 132 kN, combined mass about 24.0 kg. Reference speed 1,800 r/min, limiting speed 2,400 r/min (bearing values)." }, { "q": "Why does C3038-K-H3038 list a 170 mm shaft size when the bearing bore is 190 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 3038 has a tapered outside that engages the bearing's 190 mm tapered bore and a cylindrical bore that seats on the 170 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3038-K-H3038 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3038 K and the sleeve H 3038 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3038-K-H3038 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3038-K-H3038 set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 170 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3038", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3038-K-H3038", "SKF C 3038 K + H 3038", "C 3038 K + H 3038", "C 3038 K", "H 3038" ], "locale_variants": {}, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "max_rpm": 2400 }, { "sku": "C3040-K-H3040", "brand": "SKF", "manufacturer_designation": "SKF C 3040 K + H 3040", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 180, "D_mm": 310, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1120, "static_load_kN": 1730, "fatigue_load_limit_kN": 153, "weight_g": 30000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Digit by digit, C3040-K-H3040 = CARB bearing C 3040 K (200 mm bore, 310 mm OD, 82 mm width) + adapter sleeve H 3040 for the 180 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. The H 3040 execution mounts the 200 mm K-bore bearing with a controlled squeeze on the 180 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel. Dividing C 1120 kN by the 200 mm bore gives 5.60 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 180 mm seat is fixed and the life requirement is not. Dismounting: release the locknut of H 3040, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Housing side of C3040-K-H3040 is conventional: a 310 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 180 mm shaft.The C3040-K-H3040 unit pairs the 200 mm-bore CARB toroidal roller bearing C 3040 K with adapter sleeve H 3040, so it mounts on a plain cylindrical 180 mm shaft without a precision shoulder.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3040-K-H3040 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Keep the pair complete in stores: storing bearing C 3040 K and sleeve H 3040 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Sleeve and bearing are a matched taper pair: never fit sleeve H 3040 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 1120/1730 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3040 K + H 3040 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3040-K-H3040?", "a": "The unit is CARB bearing C 3040 K on adapter sleeve H 3040, fitting a 180 mm shaft (7.087 in), housing bore 310 mm, bearing width 82 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1120 kN, C0 1730 kN, fatigue load limit Pu 153 kN, combined mass about 30.0 kg. Reference speed 1,700 r/min, limiting speed 2,400 r/min (bearing values)." }, { "q": "Why does C3040-K-H3040 list a 180 mm shaft size when the bearing bore is 200 mm?", "a": "The sleeve takes up the difference: the adapter sleeve H 3040 has a tapered outside that engages the bearing's 200 mm tapered bore and a cylindrical bore that seats on the 180 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3040-K-H3040 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3040 K and the sleeve H 3040 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3040-K-H3040 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3040-K-H3040 set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 180 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3040", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3040-K-H3040", "SKF C 3040 K + H 3040", "C 3040 K + H 3040", "C 3040 K", "H 3040" ], "locale_variants": {}, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "max_rpm": 2400 }, { "sku": "C3044-K-OH3044-H", "brand": "SKF", "manufacturer_designation": "SKF C 3044 K + OH 3044 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 200, "D_mm": 340, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1320, "static_load_kN": 2040, "fatigue_load_limit_kN": 176, "weight_g": 37000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Housing side of C3044-K-OH3044-H is conventional: a 340 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 200 mm shaft.The C3044-K-OH3044-H unit pairs the 220 mm-bore CARB toroidal roller bearing C 3044 K with withdrawal sleeve OH 3044 H, so it mounts on a plain cylindrical 200 mm shaft without a precision shoulder.Numbering logic: the bearing half C 3044 K follows the CARB works numbering (type C, dimension series, 220 mm bore), while OH 3044 H identifies the sleeve execution for that bore; the combo C3044-K-OH3044-H exists in the catalogue so that shaft (200 mm), housing (340 mm) and both components are specified with one order number. Adapter sleeve OH 3044 H: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 200 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. Fatigue floor: Pu 176 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3044 K bearing — the sleeve execution does not change the L10 arithmetic. Mounting C3044-K-OH3044-H: clean the 200 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 340 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Do not run C3044-K-OH3044-H as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Never set C3044-K-OH3044-H by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 220 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Do not run C3044-K-OH3044-H as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 1320/2040 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3044 K + OH 3044 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3044-K-OH3044-H?", "a": "The unit is CARB bearing C 3044 K on withdrawal sleeve OH 3044 H, fitting a 200 mm shaft (7.874 in), housing bore 340 mm, bearing width 90 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1320 kN, C0 2040 kN, fatigue load limit Pu 176 kN, combined mass about 37.0 kg. Reference speed 1,600 r/min, limiting speed 2,200 r/min (bearing values)." }, { "q": "Why does C3044-K-OH3044-H list a 200 mm shaft size when the bearing bore is 220 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3044 H has a tapered outside that engages the bearing's 220 mm tapered bore and a cylindrical bore that seats on the 200 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3044-K-OH3044-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3044 K and the sleeve OH 3044 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3044-K-OH3044-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3044-K-OH3044-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 200 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3044", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3044-K-OH3044-H", "SKF C 3044 K + OH 3044 H", "C 3044 K + OH 3044 H", "C 3044 K", "OH 3044 H" ], "locale_variants": {}, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "max_rpm": 2200 }, { "sku": "C3048-K-OH3048-H", "brand": "SKF", "manufacturer_designation": "SKF C 3048 K + OH 3048 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 220, "D_mm": 360, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1340, "static_load_kN": 2160, "fatigue_load_limit_kN": 183, "weight_g": 42500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Selection arithmetic: the unit carries the ratings of its bearing — C 1340 kN, C0 2160 kN, Pu 183 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 220 mm shaft. Mounting C3048-K-OH3048-H: clean the 220 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 360 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3048 K and OH 3048 H must be checked against the application temperature before substitution.SKF C 3048 K + OH 3048 H is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 3048 K, withdrawal sleeve OH 3048 H, fitting a 220 mm cylindrical shaft seat at 360 mm housing diameter.Reading the designation: C 3048 K is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the withdrawal sleeve OH 3048 H carries the tapered bore seat on a 220 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore. The OH 3048 H execution mounts the 240 mm K-bore bearing with a controlled squeeze on the 220 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 3048 K and sleeve OH 3048 H on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Keep the pair complete in stores: storing bearing C 3048 K and sleeve OH 3048 H on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Protect the 220 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3048-K-OH3048-H.", "The 1340/2160 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3048 K + OH 3048 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3048-K-OH3048-H?", "a": "The unit is CARB bearing C 3048 K on withdrawal sleeve OH 3048 H, fitting a 220 mm shaft (8.661 in), housing bore 360 mm, bearing width 92 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1340 kN, C0 2160 kN, fatigue load limit Pu 183 kN, combined mass about 42.5 kg. Reference speed 1,500 r/min, limiting speed 2,000 r/min (bearing values)." }, { "q": "Why does C3048-K-OH3048-H list a 220 mm shaft size when the bearing bore is 240 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3048 H has a tapered outside that engages the bearing's 240 mm tapered bore and a cylindrical bore that seats on the 220 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3048-K-OH3048-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3048 K and the sleeve OH 3048 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3048-K-OH3048-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3048-K-OH3048-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 220 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3048-K-OH3048-H", "SKF C 3048 K + OH 3048 H", "C 3048 K + OH 3048 H", "C 3048 K", "OH 3048 H" ], "locale_variants": {}, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "max_rpm": 2000 }, { "sku": "C3052-K-OH3052-H", "brand": "SKF", "manufacturer_designation": "SKF C 3052 K + OH 3052 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 240, "D_mm": 400, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1760, "static_load_kN": 2850, "fatigue_load_limit_kN": 232, "weight_g": 59000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The C3052-K-OH3052-H unit pairs the 260 mm-bore CARB toroidal roller bearing C 3052 K with withdrawal sleeve OH 3052 H, so it mounts on a plain cylindrical 240 mm shaft without a precision shoulder.Reading the designation: C 3052 K is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the withdrawal sleeve OH 3052 H carries the tapered bore seat on a 240 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore. Adapter sleeve OH 3052 H: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 240 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. Fatigue floor: Pu 232 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3052 K bearing — the sleeve execution does not change the L10 arithmetic. Mounting C3052-K-OH3052-H: clean the 240 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 400 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Housing side of C3052-K-OH3052-H is conventional: a 400 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 240 mm shaft.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Do not run C3052-K-OH3052-H as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C3052-K-OH3052-H as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C3052-K-OH3052-H as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 1760/2850 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3052 K + OH 3052 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3052-K-OH3052-H?", "a": "The unit is CARB bearing C 3052 K on withdrawal sleeve OH 3052 H, fitting a 240 mm shaft (9.449 in), housing bore 400 mm, bearing width 104 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1760 kN, C0 2850 kN, fatigue load limit Pu 232 kN, combined mass about 59.0 kg. Reference speed 1,300 r/min, limiting speed 1,800 r/min (bearing values)." }, { "q": "Why does C3052-K-OH3052-H list a 240 mm shaft size when the bearing bore is 260 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3052 H has a tapered outside that engages the bearing's 260 mm tapered bore and a cylindrical bore that seats on the 240 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3052-K-OH3052-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3052 K and the sleeve OH 3052 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3052-K-OH3052-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3052-K-OH3052-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 240 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3052-K-OH3052-H", "SKF C 3052 K + OH 3052 H", "C 3052 K + OH 3052 H", "C 3052 K", "OH 3052 H" ], "locale_variants": {}, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1800, "max_rpm": 1800 }, { "sku": "C3056-K-OH3056-H", "brand": "SKF", "manufacturer_designation": "SKF C 3056 K + OH 3056 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 260, "D_mm": 420, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1860, "static_load_kN": 3100, "fatigue_load_limit_kN": 250, "weight_g": 65000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Mounting C3056-K-OH3056-H: clean the 260 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 420 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Spare-parts note: order C3056-K-OH3056-H as the unit; a bare C 3056 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.SKF C 3056 K + OH 3056 H is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 3056 K, withdrawal sleeve OH 3056 H, fitting a 260 mm cylindrical shaft seat at 420 mm housing diameter.On the SKF nameplate, C3056-K-OH3056-H reads as two catalogued components: the CARB bearing C 3056 K with its 280 mm tapered (K) bore, and the withdrawal sleeve OH 3056 H whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 260 mm shaft size. OH execution note: OH 3056 H is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 260 mm shaft seat during overhauls. Fatigue floor: Pu 250 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3056 K bearing — the sleeve execution does not change the L10 arithmetic.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 3056 K and sleeve OH 3056 H on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Protect the 260 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3056-K-OH3056-H.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 3056 H onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 1860/3100 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3056 K + OH 3056 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3056-K-OH3056-H?", "a": "The unit is CARB bearing C 3056 K on withdrawal sleeve OH 3056 H, fitting a 260 mm shaft (10.236 in), housing bore 420 mm, bearing width 106 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1860 kN, C0 3100 kN, fatigue load limit Pu 250 kN, combined mass about 65.0 kg. Reference speed 1,200 r/min, limiting speed 1,600 r/min (bearing values)." }, { "q": "Why does C3056-K-OH3056-H list a 260 mm shaft size when the bearing bore is 280 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3056 H has a tapered outside that engages the bearing's 280 mm tapered bore and a cylindrical bore that seats on the 260 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3056-K-OH3056-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3056 K and the sleeve OH 3056 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3056-K-OH3056-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3056-K-OH3056-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 260 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3056-K-OH3056-H", "SKF C 3056 K + OH 3056 H", "C 3056 K + OH 3056 H", "C 3056 K", "OH 3056 H" ], "locale_variants": {}, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1600, "max_rpm": 1600 }, { "sku": "C3060-KM-OH3060-H", "brand": "SKF", "manufacturer_designation": "SKF C 3060 KM + OH 3060 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 280, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2160, "static_load_kN": 3750, "fatigue_load_limit_kN": 290, "weight_g": 91000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3060 KM and OH 3060 H must be checked against the application temperature before substitution.The C3060-KM-OH3060-H unit pairs the 300 mm-bore CARB toroidal roller bearing C 3060 KM with withdrawal sleeve OH 3060 H, so it mounts on a plain cylindrical 280 mm shaft without a precision shoulder.Digit by digit, C3060-KM-OH3060-H = CARB bearing C 3060 KM (300 mm bore, 460 mm OD, 118 mm width) + withdrawal sleeve OH 3060 H for the 280 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Sleeve discipline: OH 3060 H and bearing C 3060 KM are ground as a matched taper pair — the sleeve's seat diameter and the bearing's bore taper are manufactured together, which is why the catalogue lists the combination as one order number (C3060-KM-OH3060-H). Dividing C 2160 kN by the 300 mm bore gives 7.20 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 280 mm seat is fixed and the life requirement is not. The locknut torque of OH 3060 H sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 300 mm CARB bearing and overheats the unit within hours.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 3060 KM and sleeve OH 3060 H on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3060-KM-OH3060-H and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Protect the 280 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3060-KM-OH3060-H.", "The 2160/3750 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3060 KM + OH 3060 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3060-KM-OH3060-H?", "a": "The unit is CARB bearing C 3060 KM on withdrawal sleeve OH 3060 H, fitting a 280 mm shaft (11.024 in), housing bore 460 mm, bearing width 118 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2160 kN, C0 3750 kN, fatigue load limit Pu 290 kN, combined mass about 91.0 kg. Reference speed 1,100 r/min, limiting speed 1,500 r/min (bearing values)." }, { "q": "Why does C3060-KM-OH3060-H list a 280 mm shaft size when the bearing bore is 300 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3060 H has a tapered outside that engages the bearing's 300 mm tapered bore and a cylindrical bore that seats on the 280 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3060-KM-OH3060-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3060 KM and the sleeve OH 3060 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3060-KM-OH3060-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3060-KM-OH3060-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 280 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3060", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3060-KM-OH3060-H", "SKF C 3060 KM + OH 3060 H", "C 3060 KM + OH 3060 H", "C 3060 KM", "OH 3060 H" ], "locale_variants": {}, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "max_rpm": 1500 }, { "sku": "C3064-KM-OH3064-H", "brand": "SKF", "manufacturer_designation": "SKF C 3064 KM + OH 3064 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 300, "D_mm": 480, "B_mm": 121, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2280, "static_load_kN": 4000, "fatigue_load_limit_kN": 305, "weight_g": 95000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering C3064-KM-OH3064-H buys one matched assembly — CARB bearing C 3064 KM on withdrawal sleeve OH 3064 H — rather than a bearing and a sleeve ordered separately for a 300 mm shaft.Digit by digit, C3064-KM-OH3064-H = CARB bearing C 3064 KM (320 mm bore, 480 mm OD, 121 mm width) + withdrawal sleeve OH 3064 H for the 300 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Adapter sleeve OH 3064 H: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 300 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. Selection arithmetic: the unit carries the ratings of its bearing — C 2280 kN, C0 4000 kN, Pu 305 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 300 mm shaft. Mounting C3064-KM-OH3064-H: clean the 300 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 480 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Spare-parts note: order C3064-KM-OH3064-H as the unit; a bare C 3064 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Never set C3064-KM-OH3064-H by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 320 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3064-KM-OH3064-H and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Never set C3064-KM-OH3064-H by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 320 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 2280/4000 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3064 KM + OH 3064 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3064-KM-OH3064-H?", "a": "The unit is CARB bearing C 3064 KM on withdrawal sleeve OH 3064 H, fitting a 300 mm shaft (11.811 in), housing bore 480 mm, bearing width 121 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2280 kN, C0 4000 kN, fatigue load limit Pu 305 kN, combined mass about 95.0 kg. Reference speed 1,000 r/min, limiting speed 1,400 r/min (bearing values)." }, { "q": "Why does C3064-KM-OH3064-H list a 300 mm shaft size when the bearing bore is 320 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3064 H has a tapered outside that engages the bearing's 320 mm tapered bore and a cylindrical bore that seats on the 300 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3064-KM-OH3064-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3064 KM and the sleeve OH 3064 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3064-KM-OH3064-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3064-KM-OH3064-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 300 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3064", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3064-KM-OH3064-H", "SKF C 3064 KM + OH 3064 H", "C 3064 KM + OH 3064 H", "C 3064 KM", "OH 3064 H" ], "locale_variants": {}, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "max_rpm": 1400 }, { "sku": "C3068-KM-OH3068-H", "brand": "SKF", "manufacturer_designation": "SKF C 3068 KM + OH 3068 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 320, "D_mm": 520, "B_mm": 133, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2900, "static_load_kN": 5000, "fatigue_load_limit_kN": 375, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Adapter sleeve OH 3068 H: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 320 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. With a combined mass of 125.0 kg over the 320×520×133 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. The locknut torque of OH 3068 H sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 340 mm CARB bearing and overheats the unit within hours. Spare-parts note: order C3068-KM-OH3068-H as the unit; a bare C 3068 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.SKF C 3068 KM + OH 3068 H is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 3068 KM, withdrawal sleeve OH 3068 H, fitting a 320 mm cylindrical shaft seat at 520 mm housing diameter.Digit by digit, C3068-KM-OH3068-H = CARB bearing C 3068 KM (340 mm bore, 520 mm OD, 133 mm width) + withdrawal sleeve OH 3068 H for the 320 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Never set C3068-KM-OH3068-H by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 340 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Do not run C3068-KM-OH3068-H as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Protect the 320 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3068-KM-OH3068-H.", "The 2900/5000 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3068 KM + OH 3068 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3068-KM-OH3068-H?", "a": "The unit is CARB bearing C 3068 KM on withdrawal sleeve OH 3068 H, fitting a 320 mm shaft (12.598 in), housing bore 520 mm, bearing width 133 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2900 kN, C0 5000 kN, fatigue load limit Pu 375 kN, combined mass about 125.0 kg. Reference speed 950 r/min, limiting speed 1,300 r/min (bearing values)." }, { "q": "Why does C3068-KM-OH3068-H list a 320 mm shaft size when the bearing bore is 340 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3068 H has a tapered outside that engages the bearing's 340 mm tapered bore and a cylindrical bore that seats on the 320 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3068-KM-OH3068-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3068 KM and the sleeve OH 3068 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3068-KM-OH3068-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3068-KM-OH3068-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 320 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3068", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3068-KM-OH3068-H", "SKF C 3068 KM + OH 3068 H", "C 3068 KM + OH 3068 H", "C 3068 KM", "OH 3068 H" ], "locale_variants": {}, "reference_speed_rpm": 950, "limiting_speed_rpm": 1300, "max_rpm": 1300 }, { "sku": "C3972-KM-OH3972-HE", "brand": "SKF", "manufacturer_designation": "SKF C 3972 KM + OH 3972 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 340, "D_mm": 480, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1760, "static_load_kN": 3250, "fatigue_load_limit_kN": 245, "weight_g": 73000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " What the H execution changes: an adapter sleeve clamps the 360 mm tapered bore onto a plain 340 mm shaft, so the housing-side location work happens at the sleeve locknut — no machined shaft shoulder is needed at the bearing seat. Fatigue floor: Pu 245 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3972 KM bearing — the sleeve execution does not change the L10 arithmetic. Mounting C3972-KM-OH3972-HE: clean the 340 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 480 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3972 KM and OH 3972 HE must be checked against the application temperature before substitution.Ordering C3972-KM-OH3972-HE buys one matched assembly — CARB bearing C 3972 KM on withdrawal sleeve OH 3972 HE — rather than a bearing and a sleeve ordered separately for a 340 mm shaft.Numbering logic: the bearing half C 3972 KM follows the CARB works numbering (type C, dimension series, 360 mm bore), while OH 3972 HE identifies the sleeve execution for that bore; the combo C3972-KM-OH3972-HE exists in the catalogue so that shaft (340 mm), housing (480 mm) and both components are specified with one order number.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Do not run C3972-KM-OH3972-HE as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3972-KM-OH3972-HE and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Protect the 340 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3972-KM-OH3972-HE.", "The 1760/3250 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3972 KM + OH 3972 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3972-KM-OH3972-HE?", "a": "The unit is CARB bearing C 3972 KM on withdrawal sleeve OH 3972 HE, fitting a 340 mm shaft (13.386 in), housing bore 480 mm, bearing width 90 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1760 kN, C0 3250 kN, fatigue load limit Pu 245 kN, combined mass about 73.0 kg. Reference speed 1,000 r/min, limiting speed 1,400 r/min (bearing values)." }, { "q": "Why does C3972-KM-OH3972-HE list a 340 mm shaft size when the bearing bore is 360 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3972 HE has a tapered outside that engages the bearing's 360 mm tapered bore and a cylindrical bore that seats on the 340 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3972-KM-OH3972-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3972 KM and the sleeve OH 3972 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3972-KM-OH3972-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3972-KM-OH3972-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 340 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3972", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3972-KM-OH3972-HE", "SKF C 3972 KM + OH 3972 HE", "C 3972 KM + OH 3972 HE", "C 3972 KM", "OH 3972 HE" ], "locale_variants": {}, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "max_rpm": 1400 }, { "sku": "C3076-KM-OH3076-H", "brand": "SKF", "manufacturer_designation": "SKF C 3076 KM + OH 3076 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 360, "D_mm": 560, "B_mm": 135, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3000, "static_load_kN": 5200, "fatigue_load_limit_kN": 380, "weight_g": 145000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Sleeve discipline: OH 3076 H and bearing C 3076 KM are ground as a matched taper pair — the sleeve's seat diameter and the bearing's bore taper are manufactured together, which is why the catalogue lists the combination as one order number (C3076-KM-OH3076-H). Dividing C 3000 kN by the 380 mm bore gives 7.89 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 360 mm seat is fixed and the life requirement is not. Mounting C3076-KM-OH3076-H: clean the 360 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 560 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Housing side of C3076-KM-OH3076-H is conventional: a 560 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 360 mm shaft.In SKF catalogue PUB BU/P1 17000, C3076-KM-OH3076-H appears as bearing C 3076 KM + withdrawal sleeve OH 3076 H: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 360 mm shaft.Digit by digit, C3076-KM-OH3076-H = CARB bearing C 3076 KM (380 mm bore, 560 mm OD, 135 mm width) + withdrawal sleeve OH 3076 H for the 360 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3076-KM-OH3076-H and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3076-KM-OH3076-H and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Never set C3076-KM-OH3076-H by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 380 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 3000/5200 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3076 KM + OH 3076 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3076-KM-OH3076-H?", "a": "The unit is CARB bearing C 3076 KM on withdrawal sleeve OH 3076 H, fitting a 360 mm shaft (14.173 in), housing bore 560 mm, bearing width 135 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3000 kN, C0 5200 kN, fatigue load limit Pu 380 kN, combined mass about 145.0 kg. Reference speed 900 r/min, limiting speed 1,200 r/min (bearing values)." }, { "q": "Why does C3076-KM-OH3076-H list a 360 mm shaft size when the bearing bore is 380 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3076 H has a tapered outside that engages the bearing's 380 mm tapered bore and a cylindrical bore that seats on the 360 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3076-KM-OH3076-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3076 KM and the sleeve OH 3076 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3076-KM-OH3076-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3076-KM-OH3076-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 360 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3076", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3076-KM-OH3076-H", "SKF C 3076 KM + OH 3076 H", "C 3076 KM + OH 3076 H", "C 3076 KM", "OH 3076 H" ], "locale_variants": {}, "reference_speed_rpm": 900, "limiting_speed_rpm": 1200, "max_rpm": 1200 }, { "sku": "C3980-KM-OH3980-HE", "brand": "SKF", "manufacturer_designation": "SKF C 3980 KM + OH 3980 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 380, "D_mm": 540, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2120, "static_load_kN": 4000, "fatigue_load_limit_kN": 290, "weight_g": 105000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The C3980-KM-OH3980-HE unit pairs the 400 mm-bore CARB toroidal roller bearing C 3980 KM with withdrawal sleeve OH 3980 HE, so it mounts on a plain cylindrical 380 mm shaft without a precision shoulder.Digit by digit, C3980-KM-OH3980-HE = CARB bearing C 3980 KM (400 mm bore, 540 mm OD, 106 mm width) + withdrawal sleeve OH 3980 HE for the 380 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Adapter sleeve OH 3980 HE: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 380 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. Fatigue floor: Pu 290 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3980 KM bearing — the sleeve execution does not change the L10 arithmetic. Dismounting: release the locknut of OH 3980 HE, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Housing side of C3980-KM-OH3980-HE is conventional: a 540 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 380 mm shaft.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Protect the 380 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3980-KM-OH3980-HE.", "Do not run C3980-KM-OH3980-HE as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 3980 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 2120/4000 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3980 KM + OH 3980 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3980-KM-OH3980-HE?", "a": "The unit is CARB bearing C 3980 KM on withdrawal sleeve OH 3980 HE, fitting a 380 mm shaft (14.961 in), housing bore 540 mm, bearing width 106 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2120 kN, C0 4000 kN, fatigue load limit Pu 290 kN, combined mass about 105.0 kg. Reference speed 900 r/min, limiting speed 1,300 r/min (bearing values)." }, { "q": "Why does C3980-KM-OH3980-HE list a 380 mm shaft size when the bearing bore is 400 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3980 HE has a tapered outside that engages the bearing's 400 mm tapered bore and a cylindrical bore that seats on the 380 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3980-KM-OH3980-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3980 KM and the sleeve OH 3980 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3980-KM-OH3980-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3980-KM-OH3980-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 380 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3980", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3980-KM-OH3980-HE", "SKF C 3980 KM + OH 3980 HE", "C 3980 KM + OH 3980 HE", "C 3980 KM", "OH 3980 HE" ], "locale_variants": {}, "reference_speed_rpm": 900, "limiting_speed_rpm": 1300, "max_rpm": 1300 }, { "sku": "C3984-KM-OH3984-HE", "brand": "SKF", "manufacturer_designation": "SKF C 3984 KM + OH 3984 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 400, "D_mm": 560, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2160, "static_load_kN": 4250, "fatigue_load_limit_kN": 310, "weight_g": 106000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Dismounting: release the locknut of OH 3984 HE, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3984 KM and OH 3984 HE must be checked against the application temperature before substitution.C3984-KM-OH3984-HE is a complete SKF mounting unit: the CARB toroidal roller bearing C 3984 KM supplied on its withdrawal sleeve OH 3984 HE, listed in SKF catalogue PUB BU/P1 17000 for a 400 mm shaft seat.On the SKF nameplate, C3984-KM-OH3984-HE reads as two catalogued components: the CARB bearing C 3984 KM with its 420 mm tapered (K) bore, and the withdrawal sleeve OH 3984 HE whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 400 mm shaft size. What the H execution changes: an adapter sleeve clamps the 420 mm tapered bore onto a plain 400 mm shaft, so the housing-side location work happens at the sleeve locknut — no machined shaft shoulder is needed at the bearing seat. Selection arithmetic: the unit carries the ratings of its bearing — C 2160 kN, C0 4250 kN, Pu 310 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 400 mm shaft.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Protect the 400 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3984-KM-OH3984-HE.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 3984 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Protect the 400 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3984-KM-OH3984-HE.", "The 2160/4250 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3984 KM + OH 3984 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3984-KM-OH3984-HE?", "a": "The unit is CARB bearing C 3984 KM on withdrawal sleeve OH 3984 HE, fitting a 400 mm shaft (15.748 in), housing bore 560 mm, bearing width 106 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2160 kN, C0 4250 kN, fatigue load limit Pu 310 kN, combined mass about 106.0 kg. Reference speed 850 r/min, limiting speed 1,200 r/min (bearing values)." }, { "q": "Why does C3984-KM-OH3984-HE list a 400 mm shaft size when the bearing bore is 420 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3984 HE has a tapered outside that engages the bearing's 420 mm tapered bore and a cylindrical bore that seats on the 400 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3984-KM-OH3984-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3984 KM and the sleeve OH 3984 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3984-KM-OH3984-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3984-KM-OH3984-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 400 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3984", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3984-KM-OH3984-HE", "SKF C 3984 KM + OH 3984 HE", "C 3984 KM + OH 3984 HE", "C 3984 KM", "OH 3984 HE" ], "locale_variants": {}, "reference_speed_rpm": 850, "limiting_speed_rpm": 1200, "max_rpm": 1200 }, { "sku": "C3088-KMB-OH3088-HE", "brand": "SKF", "manufacturer_designation": "SKF C 3088 KMB + OH 3088 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 410, "D_mm": 650, "B_mm": 157, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3750, "static_load_kN": 6400, "fatigue_load_limit_kN": 450, "weight_g": 250000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Dismounting: release the locknut of OH 3088 HE, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Spare-parts note: order C3088-KMB-OH3088-HE as the unit; a bare C 3088 KMB plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.The C3088-KMB-OH3088-HE unit pairs the 440 mm-bore CARB toroidal roller bearing C 3088 KMB with withdrawal sleeve OH 3088 HE, so it mounts on a plain cylindrical 410 mm shaft without a precision shoulder.On the SKF nameplate, C3088-KMB-OH3088-HE reads as two catalogued components: the CARB bearing C 3088 KMB with its 440 mm tapered (K) bore, and the withdrawal sleeve OH 3088 HE whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 410 mm shaft size. OH execution note: OH 3088 HE is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 410 mm shaft seat during overhauls. Fatigue floor: Pu 450 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3088 KMB bearing — the sleeve execution does not change the L10 arithmetic.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3088-KMB-OH3088-HE unit — replace the sleeve with the bearing.", "Keep the pair complete in stores: storing bearing C 3088 KMB and sleeve OH 3088 HE on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Protect the 410 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3088-KMB-OH3088-HE.", "The 3750/6400 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3088 KMB + OH 3088 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3088-KMB-OH3088-HE?", "a": "The unit is CARB bearing C 3088 KMB on withdrawal sleeve OH 3088 HE, fitting a 410 mm shaft (16.142 in), housing bore 650 mm, bearing width 157 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3750 kN, C0 6400 kN, fatigue load limit Pu 450 kN, combined mass about 250.0 kg. Reference speed 750 r/min, limiting speed 1,000 r/min (bearing values)." }, { "q": "Why does C3088-KMB-OH3088-HE list a 410 mm shaft size when the bearing bore is 440 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3088 HE has a tapered outside that engages the bearing's 440 mm tapered bore and a cylindrical bore that seats on the 410 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3088-KMB-OH3088-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3088 KMB and the sleeve OH 3088 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3088-KMB-OH3088-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3088-KMB-OH3088-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 410 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3088", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3088-KMB-OH3088-HE", "SKF C 3088 KMB + OH 3088 HE", "C 3088 KMB + OH 3088 HE", "C 3088 KMB", "OH 3088 HE" ], "locale_variants": {}, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "max_rpm": 1000 }, { "sku": "C3092-KM-OH3092-H", "brand": "SKF", "manufacturer_designation": "SKF C 3092 KM + OH 3092 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 430, "D_mm": 680, "B_mm": 163, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4000, "static_load_kN": 7500, "fatigue_load_limit_kN": 520, "weight_g": 270000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Adapter sleeve OH 3092 H: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 430 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. With a combined mass of 270.0 kg over the 430×680×163 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Mounting C3092-KM-OH3092-H: clean the 430 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 680 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Spare-parts note: order C3092-KM-OH3092-H as the unit; a bare C 3092 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.SKF C 3092 KM + OH 3092 H is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 3092 KM, withdrawal sleeve OH 3092 H, fitting a 430 mm cylindrical shaft seat at 680 mm housing diameter.Digit by digit, C3092-KM-OH3092-H = CARB bearing C 3092 KM (460 mm bore, 680 mm OD, 163 mm width) + withdrawal sleeve OH 3092 H for the 430 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Do not run C3092-KM-OH3092-H as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3092-KM-OH3092-H unit — replace the sleeve with the bearing.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3092-KM-OH3092-H unit — replace the sleeve with the bearing.", "The 4000/7500 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3092 KM + OH 3092 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3092-KM-OH3092-H?", "a": "The unit is CARB bearing C 3092 KM on withdrawal sleeve OH 3092 H, fitting a 430 mm shaft (16.929 in), housing bore 680 mm, bearing width 163 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4000 kN, C0 7500 kN, fatigue load limit Pu 520 kN, combined mass about 270.0 kg. Reference speed 700 r/min, limiting speed 950 r/min (bearing values)." }, { "q": "Why does C3092-KM-OH3092-H list a 430 mm shaft size when the bearing bore is 460 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3092 H has a tapered outside that engages the bearing's 460 mm tapered bore and a cylindrical bore that seats on the 430 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3092-KM-OH3092-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3092 KM and the sleeve OH 3092 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3092-KM-OH3092-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3092-KM-OH3092-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 430 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3092", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3092-KM-OH3092-H", "SKF C 3092 KM + OH 3092 H", "C 3092 KM + OH 3092 H", "C 3092 KM", "OH 3092 H" ], "locale_variants": {}, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "max_rpm": 950 }, { "sku": "C3096-KM-OH3096-H", "brand": "SKF", "manufacturer_designation": "SKF C 3096 KM + OH 3096 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 450, "D_mm": 700, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4050, "static_load_kN": 7800, "fatigue_load_limit_kN": 530, "weight_g": 275000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The locknut torque of OH 3096 H sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 480 mm CARB bearing and overheats the unit within hours. Spare-parts note: order C3096-KM-OH3096-H as the unit; a bare C 3096 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.Ordering C3096-KM-OH3096-H buys one matched assembly — CARB bearing C 3096 KM on withdrawal sleeve OH 3096 H — rather than a bearing and a sleeve ordered separately for a 450 mm shaft.On the SKF nameplate, C3096-KM-OH3096-H reads as two catalogued components: the CARB bearing C 3096 KM with its 480 mm tapered (K) bore, and the withdrawal sleeve OH 3096 H whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 450 mm shaft size. OH execution note: OH 3096 H is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 450 mm shaft seat during overhauls. Speed note: for C3096-KM-OH3096-H the CARB table lists 670 r/min reference and 900 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 450 mm seat.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve OH 3096 H onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 3096 H onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Keep the pair complete in stores: storing bearing C 3096 KM and sleeve OH 3096 H on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "The 4050/7800 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3096 KM + OH 3096 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3096-KM-OH3096-H?", "a": "The unit is CARB bearing C 3096 KM on withdrawal sleeve OH 3096 H, fitting a 450 mm shaft (17.717 in), housing bore 700 mm, bearing width 165 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4050 kN, C0 7800 kN, fatigue load limit Pu 530 kN, combined mass about 275.0 kg. Reference speed 670 r/min, limiting speed 900 r/min (bearing values)." }, { "q": "Why does C3096-KM-OH3096-H list a 450 mm shaft size when the bearing bore is 480 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 3096 H has a tapered outside that engages the bearing's 480 mm tapered bore and a cylindrical bore that seats on the 450 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3096-KM-OH3096-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3096 KM and the sleeve OH 3096 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3096-KM-OH3096-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3096-KM-OH3096-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 450 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C3096", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3096-KM-OH3096-H", "SKF C 3096 KM + OH 3096 H", "C 3096 KM + OH 3096 H", "C 3096 KM", "OH 3096 H" ], "locale_variants": {}, "reference_speed_rpm": 670, "limiting_speed_rpm": 900, "max_rpm": 900 }, { "sku": "C39-500-KM-OH39-500-HE", "brand": "SKF", "manufacturer_designation": "SKF C 39/500 KM + OH 39/500 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 470, "D_mm": 670, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3150, "static_load_kN": 6300, "fatigue_load_limit_kN": 430, "weight_g": 195000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C39-500-KM-OH39-500-HE appears as bearing C 39/500 KM + withdrawal sleeve OH 39/500 HE: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 470 mm shaft.Numbering logic: the bearing half C 39/500 KM follows the CARB works numbering (type C, dimension series, 500 mm bore), while OH 39/500 HE identifies the sleeve execution for that bore; the combo C39-500-KM-OH39-500-HE exists in the catalogue so that shaft (470 mm), housing (670 mm) and both components are specified with one order number. OH execution note: OH 39/500 HE is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 470 mm shaft seat during overhauls. With a combined mass of 195.0 kg over the 470×670×128 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Dismounting: release the locknut of OH 39/500 HE, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Spare-parts note: order C39-500-KM-OH39-500-HE as the unit; a bare C 39/500 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Do not run C39-500-KM-OH39-500-HE as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 39/500 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C39-500-KM-OH39-500-HE unit — replace the sleeve with the bearing.", "The 3150/6300 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 39/500 KM + OH 39/500 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C39-500-KM-OH39-500-HE?", "a": "The unit is CARB bearing C 39/500 KM on withdrawal sleeve OH 39/500 HE, fitting a 470 mm shaft (18.504 in), housing bore 670 mm, bearing width 128 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3150 kN, C0 6300 kN, fatigue load limit Pu 430 kN, combined mass about 195.0 kg. Reference speed 700 r/min, limiting speed 950 r/min (bearing values)." }, { "q": "Why does C39-500-KM-OH39-500-HE list a 470 mm shaft size when the bearing bore is 500 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 39/500 HE has a tapered outside that engages the bearing's 500 mm tapered bore and a cylindrical bore that seats on the 470 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C39-500-KM-OH39-500-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 39/500 KM and the sleeve OH 39/500 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C39-500-KM-OH39-500-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C39-500-KM-OH39-500-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 470 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-500-KM-OH39-500-HE", "SKF C 39/500 KM + OH 39/500 HE", "C 39/500 KM + OH 39/500 HE", "C 39/500 KM", "OH 39/500 HE" ], "locale_variants": {}, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "max_rpm": 950 }, { "sku": "C30-530-KM-OH30-530-H", "brand": "SKF", "manufacturer_designation": "SKF C 30/530 KM + OH 30/530 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 500, "D_mm": 780, "B_mm": 185, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5100, "static_load_kN": 9500, "fatigue_load_limit_kN": 630, "weight_g": 390000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " OH execution note: OH 30/530 H is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 500 mm shaft seat during overhauls. Fatigue floor: Pu 630 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 30/530 KM bearing — the sleeve execution does not change the L10 arithmetic. Mounting C30-530-KM-OH30-530-H: clean the 500 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 780 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Spare-parts note: order C30-530-KM-OH30-530-H as the unit; a bare C 30/530 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.Ordering C30-530-KM-OH30-530-H buys one matched assembly — CARB bearing C 30/530 KM on withdrawal sleeve OH 30/530 H — rather than a bearing and a sleeve ordered separately for a 500 mm shaft.Reading the designation: C 30/530 KM is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the withdrawal sleeve OH 30/530 H carries the tapered bore seat on a 500 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 30/530 KM and sleeve OH 30/530 H on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 30/530 H onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 30/530 H onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 5100/9500 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/530 KM + OH 30/530 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-530-KM-OH30-530-H?", "a": "The unit is CARB bearing C 30/530 KM on withdrawal sleeve OH 30/530 H, fitting a 500 mm shaft (19.685 in), housing bore 780 mm, bearing width 185 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5100 kN, C0 9500 kN, fatigue load limit Pu 630 kN, combined mass about 390.0 kg. Reference speed 600 r/min, limiting speed 800 r/min (bearing values)." }, { "q": "Why does C30-530-KM-OH30-530-H list a 500 mm shaft size when the bearing bore is 530 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 30/530 H has a tapered outside that engages the bearing's 530 mm tapered bore and a cylindrical bore that seats on the 500 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-530-KM-OH30-530-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/530 KM and the sleeve OH 30/530 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-530-KM-OH30-530-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-530-KM-OH30-530-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 500 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-530-KM-OH30-530-H", "SKF C 30/530 KM + OH 30/530 H", "C 30/530 KM + OH 30/530 H", "C 30/530 KM", "OH 30/530 H" ], "locale_variants": {}, "reference_speed_rpm": 600, "limiting_speed_rpm": 800, "max_rpm": 800 }, { "sku": "C39-560-KM-OH39-560-HE", "brand": "SKF", "manufacturer_designation": "SKF C 39/560 KM + OH 39/560 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 530, "D_mm": 750, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3600, "static_load_kN": 7350, "fatigue_load_limit_kN": 490, "weight_g": 260000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Selection arithmetic: the unit carries the ratings of its bearing — C 3600 kN, C0 7350 kN, Pu 490 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 530 mm shaft. The locknut torque of OH 39/560 HE sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 560 mm CARB bearing and overheats the unit within hours. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 39/560 KM and OH 39/560 HE must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C39-560-KM-OH39-560-HE appears as bearing C 39/560 KM + withdrawal sleeve OH 39/560 HE: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 530 mm shaft.Numbering logic: the bearing half C 39/560 KM follows the CARB works numbering (type C, dimension series, 560 mm bore), while OH 39/560 HE identifies the sleeve execution for that bore; the combo C39-560-KM-OH39-560-HE exists in the catalogue so that shaft (530 mm), housing (750 mm) and both components are specified with one order number. What the H execution changes: an adapter sleeve clamps the 560 mm tapered bore onto a plain 530 mm shaft, so the housing-side location work happens at the sleeve locknut — no machined shaft shoulder is needed at the bearing seat.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve OH 39/560 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Keep the pair complete in stores: storing bearing C 39/560 KM and sleeve OH 39/560 HE on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 39/560 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 3600/7350 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 39/560 KM + OH 39/560 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C39-560-KM-OH39-560-HE?", "a": "The unit is CARB bearing C 39/560 KM on withdrawal sleeve OH 39/560 HE, fitting a 530 mm shaft (20.866 in), housing bore 750 mm, bearing width 140 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3600 kN, C0 7350 kN, fatigue load limit Pu 490 kN, combined mass about 260.0 kg. Reference speed 600 r/min, limiting speed 850 r/min (bearing values)." }, { "q": "Why does C39-560-KM-OH39-560-HE list a 530 mm shaft size when the bearing bore is 560 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 39/560 HE has a tapered outside that engages the bearing's 560 mm tapered bore and a cylindrical bore that seats on the 530 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C39-560-KM-OH39-560-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 39/560 KM and the sleeve OH 39/560 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C39-560-KM-OH39-560-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C39-560-KM-OH39-560-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 530 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-560-KM-OH39-560-HE", "SKF C 39/560 KM + OH 39/560 HE", "C 39/560 KM + OH 39/560 HE", "C 39/560 KM", "OH 39/560 HE" ], "locale_variants": {}, "reference_speed_rpm": 600, "limiting_speed_rpm": 850, "max_rpm": 850 }, { "sku": "C30-600-KM-OH30-600-H", "brand": "SKF", "manufacturer_designation": "SKF C 30/600 KM + OH 30/600 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 560, "D_mm": 870, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6300, "static_load_kN": 12200, "fatigue_load_limit_kN": 780, "weight_g": 520000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering C30-600-KM-OH30-600-H buys one matched assembly — CARB bearing C 30/600 KM on withdrawal sleeve OH 30/600 H — rather than a bearing and a sleeve ordered separately for a 560 mm shaft.The code breaks into bearing C 30/600 KM and withdrawal sleeve OH 30/600 H: C marks the CARB type, the digit group the 600 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C30-600-KM-OH30-600-H. What the H execution changes: an adapter sleeve clamps the 600 mm tapered bore onto a plain 560 mm shaft, so the housing-side location work happens at the sleeve locknut — no machined shaft shoulder is needed at the bearing seat. The C0/C balance of about 1.94 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Mounting C30-600-KM-OH30-600-H: clean the 560 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 870 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Housing side of C30-600-KM-OH30-600-H is conventional: a 870 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 560 mm shaft.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Protect the 560 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C30-600-KM-OH30-600-H.", "Never set C30-600-KM-OH30-600-H by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 600 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Keep the pair complete in stores: storing bearing C 30/600 KM and sleeve OH 30/600 H on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "The 6300/12200 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/600 KM + OH 30/600 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-600-KM-OH30-600-H?", "a": "The unit is CARB bearing C 30/600 KM on withdrawal sleeve OH 30/600 H, fitting a 560 mm shaft (22.047 in), housing bore 870 mm, bearing width 200 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6300 kN, C0 12200 kN, fatigue load limit Pu 780 kN, combined mass about 520.0 kg. Reference speed 500 r/min, limiting speed 700 r/min (bearing values)." }, { "q": "Why does C30-600-KM-OH30-600-H list a 560 mm shaft size when the bearing bore is 600 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 30/600 H has a tapered outside that engages the bearing's 600 mm tapered bore and a cylindrical bore that seats on the 560 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-600-KM-OH30-600-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/600 KM and the sleeve OH 30/600 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-600-KM-OH30-600-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-600-KM-OH30-600-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 560 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-600-KM-OH30-600-H", "SKF C 30/600 KM + OH 30/600 H", "C 30/600 KM + OH 30/600 H", "C 30/600 KM", "OH 30/600 H" ], "locale_variants": {}, "reference_speed_rpm": 500, "limiting_speed_rpm": 700, "max_rpm": 700 }, { "sku": "C39-630-KM-OH39-630-HE", "brand": "SKF", "manufacturer_designation": "SKF C 39/630 KM + OH 39/630 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 600, "D_mm": 850, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4650, "static_load_kN": 10000, "fatigue_load_limit_kN": 640, "weight_g": 420000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Housing side of C39-630-KM-OH39-630-HE is conventional: a 850 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 600 mm shaft.SKF C 39/630 KM + OH 39/630 HE is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 39/630 KM, withdrawal sleeve OH 39/630 HE, fitting a 600 mm cylindrical shaft seat at 850 mm housing diameter.Reading the designation: C 39/630 KM is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the withdrawal sleeve OH 39/630 HE carries the tapered bore seat on a 600 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore. Adapter sleeve OH 39/630 HE: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 600 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. Speed note: for C39-630-KM-OH39-630-HE the CARB table lists 530 r/min reference and 700 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 600 mm seat. Mounting C39-630-KM-OH39-630-HE: clean the 600 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 850 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C39-630-KM-OH39-630-HE and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Protect the 600 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C39-630-KM-OH39-630-HE.", "Protect the 600 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C39-630-KM-OH39-630-HE.", "The 4650/10000 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 39/630 KM + OH 39/630 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C39-630-KM-OH39-630-HE?", "a": "The unit is CARB bearing C 39/630 KM on withdrawal sleeve OH 39/630 HE, fitting a 600 mm shaft (23.622 in), housing bore 850 mm, bearing width 165 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4650 kN, C0 10000 kN, fatigue load limit Pu 640 kN, combined mass about 420.0 kg. Reference speed 530 r/min, limiting speed 700 r/min (bearing values)." }, { "q": "Why does C39-630-KM-OH39-630-HE list a 600 mm shaft size when the bearing bore is 630 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 39/630 HE has a tapered outside that engages the bearing's 630 mm tapered bore and a cylindrical bore that seats on the 600 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C39-630-KM-OH39-630-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 39/630 KM and the sleeve OH 39/630 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C39-630-KM-OH39-630-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C39-630-KM-OH39-630-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 600 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-630-KM-OH39-630-HE", "SKF C 39/630 KM + OH 39/630 HE", "C 39/630 KM + OH 39/630 HE", "C 39/630 KM", "OH 39/630 HE" ], "locale_variants": {}, "reference_speed_rpm": 530, "limiting_speed_rpm": 700, "max_rpm": 700 }, { "sku": "C30-670-KM-OH30-670-H", "brand": "SKF", "manufacturer_designation": "SKF C 30/670 KM + OH 30/670 H", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 630, "D_mm": 980, "B_mm": 230, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8150, "static_load_kN": 16300, "fatigue_load_limit_kN": 1000, "weight_g": 750000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The code breaks into bearing C 30/670 KM and withdrawal sleeve OH 30/670 H: C marks the CARB type, the digit group the 670 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C30-670-KM-OH30-670-H. The OH 30/670 H execution mounts the 670 mm K-bore bearing with a controlled squeeze on the 630 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel. Fatigue floor: Pu 1000 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 30/670 KM bearing — the sleeve execution does not change the L10 arithmetic. Dismounting: release the locknut of OH 30/670 H, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Spare-parts note: order C30-670-KM-OH30-670-H as the unit; a bare C 30/670 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.The C30-670-KM-OH30-670-H unit pairs the 670 mm-bore CARB toroidal roller bearing C 30/670 KM with withdrawal sleeve OH 30/670 H, so it mounts on a plain cylindrical 630 mm shaft without a precision shoulder.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Never set C30-670-KM-OH30-670-H by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 670 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Do not run C30-670-KM-OH30-670-H as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C30-670-KM-OH30-670-H as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 8150/16300 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/670 KM + OH 30/670 H when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-670-KM-OH30-670-H?", "a": "The unit is CARB bearing C 30/670 KM on withdrawal sleeve OH 30/670 H, fitting a 630 mm shaft (24.803 in), housing bore 980 mm, bearing width 230 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8150 kN, C0 16300 kN, fatigue load limit Pu 1000 kN, combined mass about 750.0 kg. Reference speed 430 r/min, limiting speed 600 r/min (bearing values)." }, { "q": "Why does C30-670-KM-OH30-670-H list a 630 mm shaft size when the bearing bore is 670 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 30/670 H has a tapered outside that engages the bearing's 670 mm tapered bore and a cylindrical bore that seats on the 630 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-670-KM-OH30-670-H a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/670 KM and the sleeve OH 30/670 H separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-670-KM-OH30-670-H as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-670-KM-OH30-670-H set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 630 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-670-KM-OH30-670-H", "SKF C 30/670 KM + OH 30/670 H", "C 30/670 KM + OH 30/670 H", "C 30/670 KM", "OH 30/670 H" ], "locale_variants": {}, "reference_speed_rpm": 430, "limiting_speed_rpm": 600, "max_rpm": 600 }, { "sku": "C39-710-KM-OH39-710-HE", "brand": "SKF", "manufacturer_designation": "SKF C 39/710 KM + OH 39/710 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 670, "D_mm": 950, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6000, "static_load_kN": 12500, "fatigue_load_limit_kN": 780, "weight_g": 520000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Numbering logic: the bearing half C 39/710 KM follows the CARB works numbering (type C, dimension series, 710 mm bore), while OH 39/710 HE identifies the sleeve execution for that bore; the combo C39-710-KM-OH39-710-HE exists in the catalogue so that shaft (670 mm), housing (950 mm) and both components are specified with one order number. OH execution note: OH 39/710 HE is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 670 mm shaft seat during overhauls. With a combined mass of 520.0 kg over the 670×950×180 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Dismounting: release the locknut of OH 39/710 HE, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Housing side of C39-710-KM-OH39-710-HE is conventional: a 950 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 670 mm shaft.The C39-710-KM-OH39-710-HE unit pairs the 710 mm-bore CARB toroidal roller bearing C 39/710 KM with withdrawal sleeve OH 39/710 HE, so it mounts on a plain cylindrical 670 mm shaft without a precision shoulder.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Protect the 670 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C39-710-KM-OH39-710-HE.", "Protect the 670 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C39-710-KM-OH39-710-HE.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 39/710 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 6000/12500 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 39/710 KM + OH 39/710 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C39-710-KM-OH39-710-HE?", "a": "The unit is CARB bearing C 39/710 KM on withdrawal sleeve OH 39/710 HE, fitting a 670 mm shaft (26.378 in), housing bore 950 mm, bearing width 180 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6000 kN, C0 12500 kN, fatigue load limit Pu 780 kN, combined mass about 520.0 kg. Reference speed 450 r/min, limiting speed 630 r/min (bearing values)." }, { "q": "Why does C39-710-KM-OH39-710-HE list a 670 mm shaft size when the bearing bore is 710 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 39/710 HE has a tapered outside that engages the bearing's 710 mm tapered bore and a cylindrical bore that seats on the 670 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C39-710-KM-OH39-710-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 39/710 KM and the sleeve OH 39/710 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C39-710-KM-OH39-710-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C39-710-KM-OH39-710-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 670 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-710-KM-OH39-710-HE", "SKF C 39/710 KM + OH 39/710 HE", "C 39/710 KM + OH 39/710 HE", "C 39/710 KM", "OH 39/710 HE" ], "locale_variants": {}, "reference_speed_rpm": 450, "limiting_speed_rpm": 630, "max_rpm": 630 }, { "sku": "C39-750-KM-OH39-750-HE", "brand": "SKF", "manufacturer_designation": "SKF C 39/750 KM + OH 39/750 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 710, "D_mm": 1000, "B_mm": 185, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6100, "static_load_kN": 13400, "fatigue_load_limit_kN": 815, "weight_g": 590000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " With a combined mass of 590.0 kg over the 710×1000×185 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Mounting C39-750-KM-OH39-750-HE: clean the 710 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 1000 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Spare-parts note: order C39-750-KM-OH39-750-HE as the unit; a bare C 39/750 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.Ordering C39-750-KM-OH39-750-HE buys one matched assembly — CARB bearing C 39/750 KM on withdrawal sleeve OH 39/750 HE — rather than a bearing and a sleeve ordered separately for a 710 mm shaft.Digit by digit, C39-750-KM-OH39-750-HE = CARB bearing C 39/750 KM (750 mm bore, 1000 mm OD, 185 mm width) + withdrawal sleeve OH 39/750 HE for the 710 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. The OH 39/750 HE execution mounts the 750 mm K-bore bearing with a controlled squeeze on the 710 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 39/750 KM and sleeve OH 39/750 HE on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C39-750-KM-OH39-750-HE and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Never set C39-750-KM-OH39-750-HE by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 750 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 6100/13400 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 39/750 KM + OH 39/750 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C39-750-KM-OH39-750-HE?", "a": "The unit is CARB bearing C 39/750 KM on withdrawal sleeve OH 39/750 HE, fitting a 710 mm shaft (27.953 in), housing bore 1000 mm, bearing width 185 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6100 kN, C0 13400 kN, fatigue load limit Pu 815 kN, combined mass about 590.0 kg. Reference speed 430 r/min, limiting speed 560 r/min (bearing values)." }, { "q": "Why does C39-750-KM-OH39-750-HE list a 710 mm shaft size when the bearing bore is 750 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 39/750 HE has a tapered outside that engages the bearing's 750 mm tapered bore and a cylindrical bore that seats on the 710 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C39-750-KM-OH39-750-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 39/750 KM and the sleeve OH 39/750 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C39-750-KM-OH39-750-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C39-750-KM-OH39-750-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 710 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-750-KM-OH39-750-HE", "SKF C 39/750 KM + OH 39/750 HE", "C 39/750 KM + OH 39/750 HE", "C 39/750 KM", "OH 39/750 HE" ], "locale_variants": {}, "reference_speed_rpm": 430, "limiting_speed_rpm": 560, "max_rpm": 560 }, { "sku": "C30-800-KMB-OH30-800-HE", "brand": "SKF", "manufacturer_designation": "SKF C 30/800 KMB + OH 30/800 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 750, "D_mm": 1150, "B_mm": 258, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9300, "static_load_kN": 19300, "fatigue_load_limit_kN": 1140, "weight_g": 1150000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Mounting C30-800-KMB-OH30-800-HE: clean the 750 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 1150 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 30/800 KMB and OH 30/800 HE must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C30-800-KMB-OH30-800-HE appears as bearing C 30/800 KMB + withdrawal sleeve OH 30/800 HE: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 750 mm shaft.Digit by digit, C30-800-KMB-OH30-800-HE = CARB bearing C 30/800 KMB (800 mm bore, 1150 mm OD, 258 mm width) + withdrawal sleeve OH 30/800 HE for the 750 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. OH execution note: OH 30/800 HE is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 750 mm shaft seat during overhauls. With a combined mass of 1150.0 kg over the 750×1150×258 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Never set C30-800-KMB-OH30-800-HE by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 800 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Protect the 750 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C30-800-KMB-OH30-800-HE.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 30/800 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 9300/19300 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/800 KMB + OH 30/800 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-800-KMB-OH30-800-HE?", "a": "The unit is CARB bearing C 30/800 KMB on withdrawal sleeve OH 30/800 HE, fitting a 750 mm shaft (29.528 in), housing bore 1150 mm, bearing width 258 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 9300 kN, C0 19300 kN, fatigue load limit Pu 1140 kN, combined mass about 1150.0 kg. Reference speed 360 r/min, limiting speed 480 r/min (bearing values)." }, { "q": "Why does C30-800-KMB-OH30-800-HE list a 750 mm shaft size when the bearing bore is 800 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 30/800 HE has a tapered outside that engages the bearing's 800 mm tapered bore and a cylindrical bore that seats on the 750 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-800-KMB-OH30-800-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/800 KMB and the sleeve OH 30/800 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-800-KMB-OH30-800-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-800-KMB-OH30-800-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 750 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-800-KMB-OH30-800-HE", "SKF C 30/800 KMB + OH 30/800 HE", "C 30/800 KMB + OH 30/800 HE", "C 30/800 KMB", "OH 30/800 HE" ], "locale_variants": {}, "reference_speed_rpm": 360, "limiting_speed_rpm": 480, "max_rpm": 480 }, { "sku": "C39-850-KM-OH39-850-HE", "brand": "SKF", "manufacturer_designation": "SKF C 39/850 KM + OH 39/850 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 800, "D_mm": 1120, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 7350, "static_load_kN": 16300, "fatigue_load_limit_kN": 960, "weight_g": 785000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C39-850-KM-OH39-850-HE appears as bearing C 39/850 KM + withdrawal sleeve OH 39/850 HE: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 800 mm shaft.The code breaks into bearing C 39/850 KM and withdrawal sleeve OH 39/850 HE: C marks the CARB type, the digit group the 850 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C39-850-KM-OH39-850-HE. OH execution note: OH 39/850 HE is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 800 mm shaft seat during overhauls. Dividing C 7350 kN by the 850 mm bore gives 8.65 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 800 mm seat is fixed and the life requirement is not. Dismounting: release the locknut of OH 39/850 HE, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 39/850 KM and OH 39/850 HE must be checked against the application temperature before substitution.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve OH 39/850 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Never set C39-850-KM-OH39-850-HE by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 850 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Protect the 800 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C39-850-KM-OH39-850-HE.", "The 7350/16300 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 39/850 KM + OH 39/850 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C39-850-KM-OH39-850-HE?", "a": "The unit is CARB bearing C 39/850 KM on withdrawal sleeve OH 39/850 HE, fitting a 800 mm shaft (31.496 in), housing bore 1120 mm, bearing width 200 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7350 kN, C0 16300 kN, fatigue load limit Pu 960 kN, combined mass about 785.0 kg. Reference speed 360 r/min, limiting speed 480 r/min (bearing values)." }, { "q": "Why does C39-850-KM-OH39-850-HE list a 800 mm shaft size when the bearing bore is 850 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 39/850 HE has a tapered outside that engages the bearing's 850 mm tapered bore and a cylindrical bore that seats on the 800 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C39-850-KM-OH39-850-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 39/850 KM and the sleeve OH 39/850 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C39-850-KM-OH39-850-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C39-850-KM-OH39-850-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 800 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-850-KM-OH39-850-HE", "SKF C 39/850 KM + OH 39/850 HE", "C 39/850 KM + OH 39/850 HE", "C 39/850 KM", "OH 39/850 HE" ], "locale_variants": {}, "reference_speed_rpm": 360, "limiting_speed_rpm": 480, "max_rpm": 480 }, { "sku": "C30-900-KMB-OH30-900-HE", "brand": "SKF", "manufacturer_designation": "SKF C 30/900 KMB + OH 30/900 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 850, "D_mm": 1280, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 12700, "static_load_kN": 26500, "fatigue_load_limit_kN": 1530, "weight_g": 1520000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C30-900-KMB-OH30-900-HE appears as bearing C 30/900 KMB + withdrawal sleeve OH 30/900 HE: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 850 mm shaft.The code breaks into bearing C 30/900 KMB and withdrawal sleeve OH 30/900 HE: C marks the CARB type, the digit group the 900 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C30-900-KMB-OH30-900-HE. Sleeve discipline: OH 30/900 HE and bearing C 30/900 KMB are ground as a matched taper pair — the sleeve's seat diameter and the bearing's bore taper are manufactured together, which is why the catalogue lists the combination as one order number (C30-900-KMB-OH30-900-HE). With a combined mass of 1520.0 kg over the 850×1280×280 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Dismounting: release the locknut of OH 30/900 HE, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Housing side of C30-900-KMB-OH30-900-HE is conventional: a 1280 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 850 mm shaft.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve OH 30/900 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Protect the 850 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C30-900-KMB-OH30-900-HE.", "Never set C30-900-KMB-OH30-900-HE by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 900 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 12700/26500 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/900 KMB + OH 30/900 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-900-KMB-OH30-900-HE?", "a": "The unit is CARB bearing C 30/900 KMB on withdrawal sleeve OH 30/900 HE, fitting a 850 mm shaft (33.465 in), housing bore 1280 mm, bearing width 280 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 12700 kN, C0 26500 kN, fatigue load limit Pu 1530 kN, combined mass about 1520.0 kg. Reference speed 300 r/min, limiting speed 400 r/min (bearing values)." }, { "q": "Why does C30-900-KMB-OH30-900-HE list a 850 mm shaft size when the bearing bore is 900 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 30/900 HE has a tapered outside that engages the bearing's 900 mm tapered bore and a cylindrical bore that seats on the 850 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-900-KMB-OH30-900-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/900 KMB and the sleeve OH 30/900 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-900-KMB-OH30-900-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-900-KMB-OH30-900-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 850 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-900-KMB-OH30-900-HE", "SKF C 30/900 KMB + OH 30/900 HE", "C 30/900 KMB + OH 30/900 HE", "C 30/900 KMB", "OH 30/900 HE" ], "locale_variants": {}, "reference_speed_rpm": 300, "limiting_speed_rpm": 400, "max_rpm": 400 }, { "sku": "C31-1000-KMB-OH31-1000-HE", "brand": "SKF", "manufacturer_designation": "SKF C 31/1000 KMB + OH 31/1000 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 950, "D_mm": 1580, "B_mm": 462, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 20400, "static_load_kN": 45500, "fatigue_load_limit_kN": 2500, "weight_g": 4300000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The OH 31/1000 HE execution mounts the 1000 mm K-bore bearing with a controlled squeeze on the 950 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel. Dividing C 20400 kN by the 1000 mm bore gives 20.40 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 950 mm seat is fixed and the life requirement is not. The locknut torque of OH 31/1000 HE sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 1000 mm CARB bearing and overheats the unit within hours. Spare-parts note: order C31-1000-KMB-OH31-1000-HE as the unit; a bare C 31/1000 KMB plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.C31-1000-KMB-OH31-1000-HE is a complete SKF mounting unit: the CARB toroidal roller bearing C 31/1000 KMB supplied on its withdrawal sleeve OH 31/1000 HE, listed in SKF catalogue PUB BU/P1 17000 for a 950 mm shaft seat.Numbering logic: the bearing half C 31/1000 KMB follows the CARB works numbering (type C, dimension series, 1000 mm bore), while OH 31/1000 HE identifies the sleeve execution for that bore; the combo C31-1000-KMB-OH31-1000-HE exists in the catalogue so that shaft (950 mm), housing (1580 mm) and both components are specified with one order number.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Protect the 950 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C31-1000-KMB-OH31-1000-HE.", "Never set C31-1000-KMB-OH31-1000-HE by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 1000 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Sleeve and bearing are a matched taper pair: never fit sleeve OH 31/1000 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 20400/45500 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 31/1000 KMB + OH 31/1000 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C31-1000-KMB-OH31-1000-HE?", "a": "The unit is CARB bearing C 31/1000 KMB on withdrawal sleeve OH 31/1000 HE, fitting a 950 mm shaft (37.402 in), housing bore 1580 mm, bearing width 462 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 20400 kN, C0 45500 kN, fatigue load limit Pu 2500 kN, combined mass about 4300.0 kg. Reference speed 220 r/min, limiting speed 300 r/min (bearing values)." }, { "q": "Why does C31-1000-KMB-OH31-1000-HE list a 950 mm shaft size when the bearing bore is 1000 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 31/1000 HE has a tapered outside that engages the bearing's 1000 mm tapered bore and a cylindrical bore that seats on the 950 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C31-1000-KMB-OH31-1000-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 31/1000 KMB and the sleeve OH 31/1000 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C31-1000-KMB-OH31-1000-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C31-1000-KMB-OH31-1000-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 950 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C31", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-1000-KMB-OH31-1000-HE", "SKF C 31/1000 KMB + OH 31/1000 HE", "C 31/1000 KMB + OH 31/1000 HE", "C 31/1000 KMB", "OH 31/1000 HE" ], "locale_variants": {}, "reference_speed_rpm": 220, "limiting_speed_rpm": 300, "max_rpm": 300 }, { "sku": "C39-1060-KMB-OH39-1060-HE", "brand": "SKF", "manufacturer_designation": "SKF C 39/1060 KMB + OH 39/1060 HE", "series": "carb-adapter-sleeve", "type": "carb_toroidal", "d_mm": 1000, "D_mm": 1400, "B_mm": 250, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 11000, "static_load_kN": 26000, "fatigue_load_limit_kN": 1430, "weight_g": 1610000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Dividing C 11000 kN by the 1060 mm bore gives 10.38 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 1000 mm seat is fixed and the life requirement is not. The locknut torque of OH 39/1060 HE sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 1060 mm CARB bearing and overheats the unit within hours. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 39/1060 KMB and OH 39/1060 HE must be checked against the application temperature before substitution.The C39-1060-KMB-OH39-1060-HE unit pairs the 1060 mm-bore CARB toroidal roller bearing C 39/1060 KMB with withdrawal sleeve OH 39/1060 HE, so it mounts on a plain cylindrical 1000 mm shaft without a precision shoulder.Digit by digit, C39-1060-KMB-OH39-1060-HE = CARB bearing C 39/1060 KMB (1060 mm bore, 1400 mm OD, 250 mm width) + withdrawal sleeve OH 39/1060 HE for the 1000 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. OH execution note: OH 39/1060 HE is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 1000 mm shaft seat during overhauls.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C39-1060-KMB-OH39-1060-HE and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Protect the 1000 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C39-1060-KMB-OH39-1060-HE.", "Keep the pair complete in stores: storing bearing C 39/1060 KMB and sleeve OH 39/1060 HE on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "The 11000/26000 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 39/1060 KMB + OH 39/1060 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C39-1060-KMB-OH39-1060-HE?", "a": "The unit is CARB bearing C 39/1060 KMB on withdrawal sleeve OH 39/1060 HE, fitting a 1000 mm shaft (39.37 in), housing bore 1400 mm, bearing width 250 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 11000 kN, C0 26000 kN, fatigue load limit Pu 1430 kN, combined mass about 1610.0 kg. Reference speed 260 r/min, limiting speed 360 r/min (bearing values)." }, { "q": "Why does C39-1060-KMB-OH39-1060-HE list a 1000 mm shaft size when the bearing bore is 1060 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve OH 39/1060 HE has a tapered outside that engages the bearing's 1060 mm tapered bore and a cylindrical bore that seats on the 1000 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C39-1060-KMB-OH39-1060-HE a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 39/1060 KMB and the sleeve OH 39/1060 HE separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C39-1060-KMB-OH39-1060-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C39-1060-KMB-OH39-1060-HE set at mounting?", "a": "By driving the adapter sleeve up its conical seat: the sleeve expands on the 1000 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone." } ], "cross_ref": [ { "equiv_sku": "C39", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C39-1060-KMB-OH39-1060-HE", "SKF C 39/1060 KMB + OH 39/1060 HE", "C 39/1060 KMB + OH 39/1060 HE", "C 39/1060 KMB", "OH 39/1060 HE" ], "locale_variants": {}, "reference_speed_rpm": 260, "limiting_speed_rpm": 360, "max_rpm": 360 }, { "sku": "C2208-KTN9-AH308", "brand": "SKF", "manufacturer_designation": "SKF C 2208 KTN9 + AH 308", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 35, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 90, "static_load_kN": 86.5, "fatigue_load_limit_kN": 10.2, "weight_g": 590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The code breaks into bearing C 2208 KTN9 and withdrawal sleeve AH 308: C marks the CARB type, the digit group the 40 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C2208-KTN9-AH308. Withdrawal sleeve AH 308: at this size the sleeve is pulled onto the 35 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 40 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. With a combined mass of 0.6 kg over the 35×80×23 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Dismounting uses the withdrawal thread on AH 308: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 35 mm seat as one piece and the seat stays undamaged. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2208 KTN9 and AH 308 must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C2208-KTN9-AH308 appears as bearing C 2208 KTN9 + withdrawal sleeve AH 308 — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 1 kg.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Do not run C2208-KTN9-AH308 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Sleeve and bearing are a matched taper pair: never fit sleeve AH 308 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not run C2208-KTN9-AH308 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 90/86.5 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2208 KTN9 + AH 308 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2208-KTN9-AH308?", "a": "The unit is CARB bearing C 2208 KTN9 on withdrawal sleeve AH 308, fitting a 35 mm shaft (1.378 in), housing bore 80 mm, bearing width 23 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 90 kN, C0 86.5 kN, fatigue load limit Pu 10.2 kN, combined mass about 0.6 kg. Reference speed 8,000 r/min, limiting speed 11,000 r/min (bearing values)." }, { "q": "Why does C2208-KTN9-AH308 list a 35 mm shaft size when the bearing bore is 40 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 308 has a tapered outside that engages the bearing's 40 mm tapered bore and a cylindrical bore that seats on the 35 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2208-KTN9-AH308 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2208 KTN9 and the sleeve AH 308 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2208-KTN9-AH308 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2208-KTN9-AH308 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 308 is driven or pressed to a marked travel on the 35 mm seat, which sets the interference into the 40 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2208-KTN9-AH308", "SKF C 2208 KTN9 + AH 308", "C 2208 KTN9 + AH 308", "C 2208 KTN9", "AH 308" ], "locale_variants": {}, "reference_speed_rpm": 8000, "limiting_speed_rpm": 11000, "max_rpm": 11000 }, { "sku": "C2209-KTN9-AH309", "brand": "SKF", "manufacturer_designation": "SKF C 2209 KTN9 + AH 309", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 40, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 93, "static_load_kN": 93, "fatigue_load_limit_kN": 10.8, "weight_g": 670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The code breaks into bearing C 2209 KTN9 and withdrawal sleeve AH 309: C marks the CARB type, the digit group the 45 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C2209-KTN9-AH309. Withdrawal sleeve AH 309: at this size the sleeve is pulled onto the 40 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 45 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. Fatigue floor: Pu 10.8 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 2209 KTN9 bearing — the sleeve execution does not change the L10 arithmetic. Dismounting uses the withdrawal thread on AH 309: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 40 mm seat as one piece and the seat stays undamaged. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2209 KTN9 and AH 309 must be checked against the application temperature before substitution.The C2209-KTN9-AH309 unit combines the 45 mm-bore CARB toroidal roller bearing C 2209 KTN9 with withdrawal sleeve AH 309, giving controlled mounting interference on a plain 40 mm cylindrical seat.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Protect the 40 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C2209-KTN9-AH309.", "Do not run C2209-KTN9-AH309 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Never set C2209-KTN9-AH309 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 45 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 93/93 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2209 KTN9 + AH 309 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2209-KTN9-AH309?", "a": "The unit is CARB bearing C 2209 KTN9 on withdrawal sleeve AH 309, fitting a 40 mm shaft (1.575 in), housing bore 85 mm, bearing width 23 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 93 kN, C0 93 kN, fatigue load limit Pu 10.8 kN, combined mass about 0.7 kg. Reference speed 7,500 r/min, limiting speed 11,000 r/min (bearing values)." }, { "q": "Why does C2209-KTN9-AH309 list a 40 mm shaft size when the bearing bore is 45 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 309 has a tapered outside that engages the bearing's 45 mm tapered bore and a cylindrical bore that seats on the 40 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2209-KTN9-AH309 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2209 KTN9 and the sleeve AH 309 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2209-KTN9-AH309 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2209-KTN9-AH309 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 309 is driven or pressed to a marked travel on the 40 mm seat, which sets the interference into the 45 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2209-KTN9-AH309", "SKF C 2209 KTN9 + AH 309", "C 2209 KTN9 + AH 309", "C 2209 KTN9", "AH 309" ], "locale_variants": {}, "reference_speed_rpm": 7500, "limiting_speed_rpm": 11000, "max_rpm": 11000 }, { "sku": "C2210-KTN9-AHX310", "brand": "SKF", "manufacturer_designation": "SKF C 2210 KTN9 + AHX 310", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 45, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 98, "static_load_kN": 100, "fatigue_load_limit_kN": 11.8, "weight_g": 720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Spare-parts note: order C2210-KTN9-AHX310 as the unit; a bare C 2210 KTN9 plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.C2210-KTN9-AHX310 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 2210 KTN9 on withdrawal sleeve AHX 310, listed in SKF catalogue PUB BU/P1 17000 for a 45 mm shaft seat.On the SKF nameplate, C2210-KTN9-AHX310 reads as two catalogued components: the CARB bearing C 2210 KTN9 with its 50 mm tapered (K) bore, and the withdrawal sleeve AHX 310 whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 45 mm shaft size. Combined mass of the unit — bearing C 2210 KTN9 plus sleeve AHX 310 — is about 1 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. Selection arithmetic: the unit carries the ratings of its bearing — C 98 kN, C0 100 kN, Pu 11.8 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 45 mm shaft. Dismounting uses the withdrawal thread on AHX 310: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 45 mm seat as one piece and the seat stays undamaged.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2210-KTN9-AHX310 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2210-KTN9-AHX310 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Sleeve and bearing are a matched taper pair: never fit sleeve AHX 310 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 98/100 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2210 KTN9 + AHX 310 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2210-KTN9-AHX310?", "a": "The unit is CARB bearing C 2210 KTN9 on withdrawal sleeve AHX 310, fitting a 45 mm shaft (1.772 in), housing bore 90 mm, bearing width 23 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 98 kN, C0 100 kN, fatigue load limit Pu 11.8 kN, combined mass about 0.7 kg. Reference speed 7,000 r/min, limiting speed 9,500 r/min (bearing values)." }, { "q": "Why does C2210-KTN9-AHX310 list a 45 mm shaft size when the bearing bore is 50 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AHX 310 has a tapered outside that engages the bearing's 50 mm tapered bore and a cylindrical bore that seats on the 45 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2210-KTN9-AHX310 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2210 KTN9 and the sleeve AHX 310 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2210-KTN9-AHX310 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2210-KTN9-AHX310 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AHX 310 is driven or pressed to a marked travel on the 45 mm seat, which sets the interference into the 50 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2210-KTN9-AHX310", "SKF C 2210 KTN9 + AHX 310", "C 2210 KTN9 + AHX 310", "C 2210 KTN9", "AHX 310" ], "locale_variants": {}, "reference_speed_rpm": 7000, "limiting_speed_rpm": 9500, "max_rpm": 9500 }, { "sku": "C2211-KTN9-AHX311", "brand": "SKF", "manufacturer_designation": "SKF C 2211 KTN9 + AHX 311", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 50, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 116, "static_load_kN": 114, "fatigue_load_limit_kN": 13.4, "weight_g": 950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Housing side of C2211-KTN9-AHX311 is conventional: a 100 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 50 mm shaft.C2211-KTN9-AHX311 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 2211 KTN9 on withdrawal sleeve AHX 311, listed in SKF catalogue PUB BU/P1 17000 for a 50 mm shaft seat.Digit by digit, C2211-KTN9-AHX311 = CARB bearing C 2211 KTN9 (55 mm bore, 100 mm OD, 25 mm width) + withdrawal sleeve AHX 311 for the 50 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Combined mass of the unit — bearing C 2211 KTN9 plus sleeve AHX 311 — is about 1 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. Selection arithmetic: the unit carries the ratings of its bearing — C 116 kN, C0 114 kN, Pu 13.4 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 50 mm shaft. Record the sleeve travel at mounting of C2211-KTN9-AHX311: the clearance set into the 55 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 50 mm shaft over the years.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Protect the 50 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C2211-KTN9-AHX311.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2211-KTN9-AHX311 unit — replace the sleeve with the bearing.", "Sleeve and bearing are a matched taper pair: never fit sleeve AHX 311 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 116/114 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2211 KTN9 + AHX 311 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2211-KTN9-AHX311?", "a": "The unit is CARB bearing C 2211 KTN9 on withdrawal sleeve AHX 311, fitting a 50 mm shaft (1.969 in), housing bore 100 mm, bearing width 25 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 116 kN, C0 114 kN, fatigue load limit Pu 13.4 kN, combined mass about 0.9 kg. Reference speed 6,300 r/min, limiting speed 9,000 r/min (bearing values)." }, { "q": "Why does C2211-KTN9-AHX311 list a 50 mm shaft size when the bearing bore is 55 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AHX 311 has a tapered outside that engages the bearing's 55 mm tapered bore and a cylindrical bore that seats on the 50 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2211-KTN9-AHX311 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2211 KTN9 and the sleeve AHX 311 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2211-KTN9-AHX311 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2211-KTN9-AHX311 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AHX 311 is driven or pressed to a marked travel on the 50 mm seat, which sets the interference into the 55 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2211-KTN9-AHX311", "SKF C 2211 KTN9 + AHX 311", "C 2211 KTN9 + AHX 311", "C 2211 KTN9", "AHX 311" ], "locale_variants": {}, "reference_speed_rpm": 6300, "limiting_speed_rpm": 9000, "max_rpm": 9000 }, { "sku": "C2212-KTN9-AHX312", "brand": "SKF", "manufacturer_designation": "SKF C 2212 KTN9 + AHX 312", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 55, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 143, "static_load_kN": 156, "fatigue_load_limit_kN": 18.3, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2212 KTN9 and AHX 312 must be checked against the application temperature before substitution.C2212-KTN9-AHX312 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 2212 KTN9 on withdrawal sleeve AHX 312, listed in SKF catalogue PUB BU/P1 17000 for a 55 mm shaft seat.Digit by digit, C2212-KTN9-AHX312 = CARB bearing C 2212 KTN9 (60 mm bore, 110 mm OD, 28 mm width) + withdrawal sleeve AHX 312 for the 55 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Combined mass of the unit — bearing C 2212 KTN9 plus sleeve AHX 312 — is about 1 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. The C0/C balance of about 1.09 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Dismounting uses the withdrawal thread on AHX 312: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 55 mm seat as one piece and the seat stays undamaged.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve AHX 312 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Never set C2212-KTN9-AHX312 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 60 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Sleeve and bearing are a matched taper pair: never fit sleeve AHX 312 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 143/156 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2212 KTN9 + AHX 312 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2212-KTN9-AHX312?", "a": "The unit is CARB bearing C 2212 KTN9 on withdrawal sleeve AHX 312, fitting a 55 mm shaft (2.165 in), housing bore 110 mm, bearing width 28 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 143 kN, C0 156 kN, fatigue load limit Pu 18.3 kN, combined mass about 1.3 kg. Reference speed 5,600 r/min, limiting speed 7,500 r/min (bearing values)." }, { "q": "Why does C2212-KTN9-AHX312 list a 55 mm shaft size when the bearing bore is 60 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AHX 312 has a tapered outside that engages the bearing's 60 mm tapered bore and a cylindrical bore that seats on the 55 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2212-KTN9-AHX312 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2212 KTN9 and the sleeve AHX 312 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2212-KTN9-AHX312 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2212-KTN9-AHX312 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AHX 312 is driven or pressed to a marked travel on the 55 mm seat, which sets the interference into the 60 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2212-KTN9-AHX312", "SKF C 2212 KTN9 + AHX 312", "C 2212 KTN9 + AHX 312", "C 2212 KTN9", "AHX 312" ], "locale_variants": {}, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "max_rpm": 7500 }, { "sku": "C2213-KTN9-AH313-G", "brand": "SKF", "manufacturer_designation": "SKF C 2213 KTN9 + AH 313 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 60, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 180, "static_load_kN": 180, "fatigue_load_limit_kN": 21.2, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Dismounting uses the withdrawal thread on AH 313 G: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 60 mm seat as one piece and the seat stays undamaged. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2213 KTN9 and AH 313 G must be checked against the application temperature before substitution.The C2213-KTN9-AH313-G unit combines the 65 mm-bore CARB toroidal roller bearing C 2213 KTN9 with withdrawal sleeve AH 313 G, giving controlled mounting interference on a plain 60 mm cylindrical seat.On the SKF nameplate, C2213-KTN9-AH313-G reads as two catalogued components: the CARB bearing C 2213 KTN9 with its 65 mm tapered (K) bore, and the withdrawal sleeve AH 313 G whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 60 mm shaft size. Why a withdrawal sleeve at 60 mm shaft: adapter-sleeve locknut forces become impractical on the 65 mm bore; the AH 313 G execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. The C0/C balance of about 1.00 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Do not run C2213-KTN9-AH313-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Sleeve and bearing are a matched taper pair: never fit sleeve AH 313 G onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not run C2213-KTN9-AH313-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 180/180 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2213 KTN9 + AH 313 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2213-KTN9-AH313-G?", "a": "The unit is CARB bearing C 2213 KTN9 on withdrawal sleeve AH 313 G, fitting a 60 mm shaft (2.362 in), housing bore 120 mm, bearing width 31 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 180 kN, C0 180 kN, fatigue load limit Pu 21.2 kN, combined mass about 1.6 kg. Reference speed 5,300 r/min, limiting speed 7,500 r/min (bearing values)." }, { "q": "Why does C2213-KTN9-AH313-G list a 60 mm shaft size when the bearing bore is 65 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 313 G has a tapered outside that engages the bearing's 65 mm tapered bore and a cylindrical bore that seats on the 60 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2213-KTN9-AH313-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2213 KTN9 and the sleeve AH 313 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2213-KTN9-AH313-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2213-KTN9-AH313-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 313 G is driven or pressed to a marked travel on the 60 mm seat, which sets the interference into the 65 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2213", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2213-KTN9-AH313-G", "SKF C 2213 KTN9 + AH 313 G", "C 2213 KTN9 + AH 313 G", "C 2213 KTN9", "AH 313 G" ], "locale_variants": {}, "reference_speed_rpm": 5300, "limiting_speed_rpm": 7500, "max_rpm": 7500 }, { "sku": "C2214-KTN9-AH314-G", "brand": "SKF", "manufacturer_designation": "SKF C 2214 KTN9 + AH 314 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 65, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 186, "static_load_kN": 196, "fatigue_load_limit_kN": 22.8, "weight_g": 1700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "On the SKF nameplate, C2214-KTN9-AH314-G reads as two catalogued components: the CARB bearing C 2214 KTN9 with its 70 mm tapered (K) bore, and the withdrawal sleeve AH 314 G whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 65 mm shaft size. Withdrawal sleeve AH 314 G: at this size the sleeve is pulled onto the 65 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 70 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. The C0/C balance of about 1.05 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Mounting C2214-KTN9-AH314-G at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 65 mm seat and verify the residual radial clearance of the 70 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. Housing side of C2214-KTN9-AH314-G is conventional: a 125 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 65 mm shaft.In SKF catalogue PUB BU/P1 17000, C2214-KTN9-AH314-G appears as bearing C 2214 KTN9 + withdrawal sleeve AH 314 G — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 2 kg.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve AH 314 G onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Protect the 65 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C2214-KTN9-AH314-G.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2214-KTN9-AH314-G unit — replace the sleeve with the bearing.", "The 186/196 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2214 KTN9 + AH 314 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2214-KTN9-AH314-G?", "a": "The unit is CARB bearing C 2214 KTN9 on withdrawal sleeve AH 314 G, fitting a 65 mm shaft (2.559 in), housing bore 125 mm, bearing width 31 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 186 kN, C0 196 kN, fatigue load limit Pu 22.8 kN, combined mass about 1.7 kg. Reference speed 5,000 r/min, limiting speed 7,000 r/min (bearing values)." }, { "q": "Why does C2214-KTN9-AH314-G list a 65 mm shaft size when the bearing bore is 70 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 314 G has a tapered outside that engages the bearing's 70 mm tapered bore and a cylindrical bore that seats on the 65 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2214-KTN9-AH314-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2214 KTN9 and the sleeve AH 314 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2214-KTN9-AH314-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2214-KTN9-AH314-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 314 G is driven or pressed to a marked travel on the 65 mm seat, which sets the interference into the 70 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2214-KTN9-AH314-G", "SKF C 2214 KTN9 + AH 314 G", "C 2214 KTN9 + AH 314 G", "C 2214 KTN9", "AH 314 G" ], "locale_variants": {}, "reference_speed_rpm": 5000, "limiting_speed_rpm": 7000, "max_rpm": 7000 }, { "sku": "C2215-K-AH315-G", "brand": "SKF", "manufacturer_designation": "SKF C 2215 K + AH 315 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 70, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 196, "static_load_kN": 208, "fatigue_load_limit_kN": 24, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C2215-K-AH315-G appears as bearing C 2215 K + withdrawal sleeve AH 315 G — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 2 kg.On the SKF nameplate, C2215-K-AH315-G reads as two catalogued components: the CARB bearing C 2215 K with its 75 mm tapered (K) bore, and the withdrawal sleeve AH 315 G whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 70 mm shaft size. The AH 315 G execution defines the fit on the 70 mm cylindrical seat by sleeve travel rather than locknut torque; the mounting procedure records that travel, because the running clearance of the CARB bearing is set by the same taper. With a combined mass of 1.9 kg over the 70×130×31 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Record the sleeve travel at mounting of C2215-K-AH315-G: the clearance set into the 75 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 70 mm shaft over the years. Spare-parts note: order C2215-K-AH315-G as the unit; a bare C 2215 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Never set C2215-K-AH315-G by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 75 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2215-K-AH315-G unit — replace the sleeve with the bearing.", "Do not run C2215-K-AH315-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 196/208 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2215 K + AH 315 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2215-K-AH315-G?", "a": "The unit is CARB bearing C 2215 K on withdrawal sleeve AH 315 G, fitting a 70 mm shaft (2.756 in), housing bore 130 mm, bearing width 31 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 196 kN, C0 208 kN, fatigue load limit Pu 24 kN, combined mass about 1.9 kg. Reference speed 4,800 r/min, limiting speed 6,700 r/min (bearing values)." }, { "q": "Why does C2215-K-AH315-G list a 70 mm shaft size when the bearing bore is 75 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 315 G has a tapered outside that engages the bearing's 75 mm tapered bore and a cylindrical bore that seats on the 70 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2215-K-AH315-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2215 K and the sleeve AH 315 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2215-K-AH315-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2215-K-AH315-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 315 G is driven or pressed to a marked travel on the 70 mm seat, which sets the interference into the 75 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2215-K-AH315-G", "SKF C 2215 K + AH 315 G", "C 2215 K + AH 315 G", "C 2215 K", "AH 315 G" ], "locale_variants": {}, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6700, "max_rpm": 6700 }, { "sku": "C2216-K-AH316", "brand": "SKF", "manufacturer_designation": "SKF C 2216 K + AH 316", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 75, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 220, "static_load_kN": 250, "fatigue_load_limit_kN": 28.5, "weight_g": 2350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Spare-parts note: order C2216-K-AH316 as the unit; a bare C 2216 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.In SKF catalogue PUB BU/P1 17000, C2216-K-AH316 appears as bearing C 2216 K + withdrawal sleeve AH 316 — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 2 kg.Digit by digit, C2216-K-AH316 = CARB bearing C 2216 K (80 mm bore, 140 mm OD, 33 mm width) + withdrawal sleeve AH 316 for the 75 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Sleeve discipline for AH 316: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution. Speed note: for C2216-K-AH316 the CARB table lists 4,300 r/min reference and 6,000 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 75 mm seat. Dismounting uses the withdrawal thread on AH 316: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 75 mm seat as one piece and the seat stays undamaged.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2216-K-AH316 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Keep the pair complete in stores: storing bearing C 2216 K and sleeve AH 316 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2216-K-AH316 unit — replace the sleeve with the bearing.", "The 220/250 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2216 K + AH 316 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2216-K-AH316?", "a": "The unit is CARB bearing C 2216 K on withdrawal sleeve AH 316, fitting a 75 mm shaft (2.953 in), housing bore 140 mm, bearing width 33 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 220 kN, C0 250 kN, fatigue load limit Pu 28.5 kN, combined mass about 2.4 kg. Reference speed 4,300 r/min, limiting speed 6,000 r/min (bearing values)." }, { "q": "Why does C2216-K-AH316 list a 75 mm shaft size when the bearing bore is 80 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 316 has a tapered outside that engages the bearing's 80 mm tapered bore and a cylindrical bore that seats on the 75 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2216-K-AH316 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2216 K and the sleeve AH 316 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2216-K-AH316 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2216-K-AH316 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 316 is driven or pressed to a marked travel on the 75 mm seat, which sets the interference into the 80 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2216-K-AH316", "SKF C 2216 K + AH 316", "C 2216 K + AH 316", "C 2216 K", "AH 316" ], "locale_variants": {}, "reference_speed_rpm": 4300, "limiting_speed_rpm": 6000, "max_rpm": 6000 }, { "sku": "C2217-K-AHX317", "brand": "SKF", "manufacturer_designation": "SKF C 2217 K + AHX 317", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 80, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 275, "static_load_kN": 320, "fatigue_load_limit_kN": 35.5, "weight_g": 3000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Digit by digit, C2217-K-AHX317 = CARB bearing C 2217 K (85 mm bore, 150 mm OD, 36 mm width) + withdrawal sleeve AHX 317 for the 80 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. The AHX 317 execution defines the fit on the 80 mm cylindrical seat by sleeve travel rather than locknut torque; the mounting procedure records that travel, because the running clearance of the CARB bearing is set by the same taper. Speed note: for C2217-K-AHX317 the CARB table lists 4,000 r/min reference and 5,600 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 80 mm seat. Record the sleeve travel at mounting of C2217-K-AHX317: the clearance set into the 85 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 80 mm shaft over the years. Housing side of C2217-K-AHX317 is conventional: a 150 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 80 mm shaft.C2217-K-AHX317 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 2217 K on withdrawal sleeve AHX 317, listed in SKF catalogue PUB BU/P1 17000 for a 80 mm shaft seat.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2217-K-AHX317 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Do not run C2217-K-AHX317 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Sleeve and bearing are a matched taper pair: never fit sleeve AHX 317 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 275/320 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2217 K + AHX 317 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2217-K-AHX317?", "a": "The unit is CARB bearing C 2217 K on withdrawal sleeve AHX 317, fitting a 80 mm shaft (3.15 in), housing bore 150 mm, bearing width 36 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 275 kN, C0 320 kN, fatigue load limit Pu 35.5 kN, combined mass about 3.0 kg. Reference speed 4,000 r/min, limiting speed 5,600 r/min (bearing values)." }, { "q": "Why does C2217-K-AHX317 list a 80 mm shaft size when the bearing bore is 85 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AHX 317 has a tapered outside that engages the bearing's 85 mm tapered bore and a cylindrical bore that seats on the 80 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2217-K-AHX317 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2217 K and the sleeve AHX 317 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2217-K-AHX317 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2217-K-AHX317 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AHX 317 is driven or pressed to a marked travel on the 80 mm seat, which sets the interference into the 85 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2217-K-AHX317", "SKF C 2217 K + AHX 317", "C 2217 K + AHX 317", "C 2217 K", "AHX 317" ], "locale_variants": {}, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5600, "max_rpm": 5600 }, { "sku": "C2218-K-AHX318", "brand": "SKF", "manufacturer_designation": "SKF C 2218 K + AHX 318", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 85, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 380, "fatigue_load_limit_kN": 41.5, "weight_g": 3750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Record the sleeve travel at mounting of C2218-K-AHX318: the clearance set into the 90 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 85 mm shaft over the years. Housing side of C2218-K-AHX318 is conventional: a 160 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 85 mm shaft.The C2218-K-AHX318 unit combines the 90 mm-bore CARB toroidal roller bearing C 2218 K with withdrawal sleeve AHX 318, giving controlled mounting interference on a plain 85 mm cylindrical seat.Digit by digit, C2218-K-AHX318 = CARB bearing C 2218 K (90 mm bore, 160 mm OD, 40 mm width) + withdrawal sleeve AHX 318 for the 85 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Combined mass of the unit — bearing C 2218 K plus sleeve AHX 318 — is about 4 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. Fatigue floor: Pu 41.5 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 2218 K bearing — the sleeve execution does not change the L10 arithmetic.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2218-K-AHX318 unit — replace the sleeve with the bearing.", "Do not run C2218-K-AHX318 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C2218-K-AHX318 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 325/380 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2218 K + AHX 318 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2218-K-AHX318?", "a": "The unit is CARB bearing C 2218 K on withdrawal sleeve AHX 318, fitting a 85 mm shaft (3.346 in), housing bore 160 mm, bearing width 40 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 325 kN, C0 380 kN, fatigue load limit Pu 41.5 kN, combined mass about 3.8 kg. Reference speed 3,800 r/min, limiting speed 5,300 r/min (bearing values)." }, { "q": "Why does C2218-K-AHX318 list a 85 mm shaft size when the bearing bore is 90 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AHX 318 has a tapered outside that engages the bearing's 90 mm tapered bore and a cylindrical bore that seats on the 85 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2218-K-AHX318 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2218 K and the sleeve AHX 318 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2218-K-AHX318 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2218-K-AHX318 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AHX 318 is driven or pressed to a marked travel on the 85 mm seat, which sets the interference into the 90 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2218-K-AHX318", "SKF C 2218 K + AHX 318", "C 2218 K + AHX 318", "C 2218 K", "AHX 318" ], "locale_variants": {}, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "max_rpm": 5300 }, { "sku": "C2319-K-AHX2319", "brand": "SKF", "manufacturer_designation": "SKF C 2319 K + AHX 2319", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 90, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 610, "static_load_kN": 695, "fatigue_load_limit_kN": 73.5, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 90 mm shaft SKF lists C2319-K-AHX2319 as the complete unit: CARB bearing C 2319 K plus withdrawal sleeve AHX 2319, one catalogue entry covering both components.On the SKF nameplate, C2319-K-AHX2319 reads as two catalogued components: the CARB bearing C 2319 K with its 95 mm tapered (K) bore, and the withdrawal sleeve AHX 2319 whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 90 mm shaft size. Withdrawal sleeve AHX 2319: at this size the sleeve is pulled onto the 90 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 95 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. The C0/C balance of about 1.14 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Dismounting uses the withdrawal thread on AHX 2319: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 90 mm seat as one piece and the seat stays undamaged. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2319 K and AHX 2319 must be checked against the application temperature before substitution.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve AHX 2319 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Keep the pair complete in stores: storing bearing C 2319 K and sleeve AHX 2319 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Never set C2319-K-AHX2319 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 95 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 610/695 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2319 K + AHX 2319 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2319-K-AHX2319?", "a": "The unit is CARB bearing C 2319 K on withdrawal sleeve AHX 2319, fitting a 90 mm shaft (3.543 in), housing bore 200 mm, bearing width 67 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 610 kN, C0 695 kN, fatigue load limit Pu 73.5 kN, combined mass about 11.0 kg. Reference speed 2,800 r/min, limiting speed 4,000 r/min (bearing values)." }, { "q": "Why does C2319-K-AHX2319 list a 90 mm shaft size when the bearing bore is 95 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AHX 2319 has a tapered outside that engages the bearing's 95 mm tapered bore and a cylindrical bore that seats on the 90 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2319-K-AHX2319 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2319 K and the sleeve AHX 2319 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2319-K-AHX2319 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2319-K-AHX2319 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AHX 2319 is driven or pressed to a marked travel on the 90 mm seat, which sets the interference into the 95 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2319-K-AHX2319", "SKF C 2319 K + AHX 2319", "C 2319 K + AHX 2319", "C 2319 K", "AHX 2319" ], "locale_variants": {}, "reference_speed_rpm": 2800, "limiting_speed_rpm": 4000, "max_rpm": 4000 }, { "sku": "C2220-K-AHX320", "brand": "SKF", "manufacturer_designation": "SKF C 2220 K + AHX 320", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 95, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 415, "static_load_kN": 465, "fatigue_load_limit_kN": 49, "weight_g": 5300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Digit by digit, C2220-K-AHX320 = CARB bearing C 2220 K (100 mm bore, 180 mm OD, 46 mm width) + withdrawal sleeve AHX 320 for the 95 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Sleeve discipline for AHX 320: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution. Fatigue floor: Pu 49 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 2220 K bearing — the sleeve execution does not change the L10 arithmetic. Mounting C2220-K-AHX320 at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 95 mm seat and verify the residual radial clearance of the 100 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. Spare-parts note: order C2220-K-AHX320 as the unit; a bare C 2220 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.C2220-K-AHX320 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 2220 K on withdrawal sleeve AHX 320, listed in SKF catalogue PUB BU/P1 17000 for a 95 mm shaft seat.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Do not run C2220-K-AHX320 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Keep the pair complete in stores: storing bearing C 2220 K and sleeve AHX 320 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Protect the 95 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C2220-K-AHX320.", "The 415/465 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2220 K + AHX 320 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2220-K-AHX320?", "a": "The unit is CARB bearing C 2220 K on withdrawal sleeve AHX 320, fitting a 95 mm shaft (3.74 in), housing bore 180 mm, bearing width 46 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 415 kN, C0 465 kN, fatigue load limit Pu 49 kN, combined mass about 5.3 kg. Reference speed 3,600 r/min, limiting speed 4,800 r/min (bearing values)." }, { "q": "Why does C2220-K-AHX320 list a 95 mm shaft size when the bearing bore is 100 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AHX 320 has a tapered outside that engages the bearing's 100 mm tapered bore and a cylindrical bore that seats on the 95 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2220-K-AHX320 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2220 K and the sleeve AHX 320 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2220-K-AHX320 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2220-K-AHX320 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AHX 320 is driven or pressed to a marked travel on the 95 mm seat, which sets the interference into the 100 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2220-K-AHX320", "SKF C 2220 K + AHX 320", "C 2220 K + AHX 320", "C 2220 K", "AHX 320" ], "locale_variants": {}, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "max_rpm": 4800 }, { "sku": "C2222-K-AHX3122", "brand": "SKF", "manufacturer_designation": "SKF C 2222 K + AHX 3122", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 105, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 530, "static_load_kN": 620, "fatigue_load_limit_kN": 64, "weight_g": 7650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C2222-K-AHX3122 appears as bearing C 2222 K + withdrawal sleeve AHX 3122 — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 8 kg.Reading the designation: C 2222 K is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the withdrawal sleeve AHX 3122 carries the tapered bore seat on a 105 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore. Sleeve discipline for AHX 3122: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution. Dividing C 530 kN by the 110 mm bore gives 4.82 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 105 mm seat is fixed and the life requirement is not. Mounting C2222-K-AHX3122 at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 105 mm seat and verify the residual radial clearance of the 110 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. Spare-parts note: order C2222-K-AHX3122 as the unit; a bare C 2222 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Do not run C2222-K-AHX3122 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2222-K-AHX3122 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Protect the 105 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C2222-K-AHX3122.", "The 530/620 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 2222 K + AHX 3122 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C2222-K-AHX3122?", "a": "The unit is CARB bearing C 2222 K on withdrawal sleeve AHX 3122, fitting a 105 mm shaft (4.134 in), housing bore 200 mm, bearing width 53 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 530 kN, C0 620 kN, fatigue load limit Pu 64 kN, combined mass about 7.7 kg. Reference speed 3,200 r/min, limiting speed 4,300 r/min (bearing values)." }, { "q": "Why does C2222-K-AHX3122 list a 105 mm shaft size when the bearing bore is 110 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AHX 3122 has a tapered outside that engages the bearing's 110 mm tapered bore and a cylindrical bore that seats on the 105 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C2222-K-AHX3122 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 2222 K and the sleeve AHX 3122 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C2222-K-AHX3122 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C2222-K-AHX3122 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AHX 3122 is driven or pressed to a marked travel on the 105 mm seat, which sets the interference into the 110 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C2222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C2222-K-AHX3122", "SKF C 2222 K + AHX 3122", "C 2222 K + AHX 3122", "C 2222 K", "AHX 3122" ], "locale_variants": {}, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "max_rpm": 4300 }, { "sku": "C4024-K30V-VE240-AH24024", "brand": "SKF", "manufacturer_designation": "SKF C 4024 K30V/VE240 + AH 24024", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 115, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 430, "static_load_kN": 640, "fatigue_load_limit_kN": 65.5, "weight_g": 5650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 115 mm shaft SKF lists C4024-K30V-VE240-AH24024 as the complete unit: CARB bearing C 4024 K30V/VE240 plus withdrawal sleeve AH 24024, one catalogue entry covering both components.Digit by digit, C4024-K30V-VE240-AH24024 = CARB bearing C 4024 K30V/VE240 (120 mm bore, 180 mm OD, 60 mm width) + withdrawal sleeve AH 24024 for the 115 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Combined mass of the unit — bearing C 4024 K30V/VE240 plus sleeve AH 24024 — is about 6 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. Dividing C 430 kN by the 120 mm bore gives 3.58 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 115 mm seat is fixed and the life requirement is not. Dismounting uses the withdrawal thread on AH 24024: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 115 mm seat as one piece and the seat stays undamaged. Spare-parts note: order C4024-K30V-VE240-AH24024 as the unit; a bare C 4024 K30V/VE240 plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C4024-K30V-VE240-AH24024 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C4024-K30V-VE240-AH24024 unit — replace the sleeve with the bearing.", "Sleeve and bearing are a matched taper pair: never fit sleeve AH 24024 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 430/640 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 4024 K30V/VE240 + AH 24024 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C4024-K30V-VE240-AH24024?", "a": "The unit is CARB bearing C 4024 K30V/VE240 on withdrawal sleeve AH 24024, fitting a 115 mm shaft (4.528 in), housing bore 180 mm, bearing width 60 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 430 kN, C0 640 kN, fatigue load limit Pu 65.5 kN, combined mass about 5.7 kg. The catalogue lists no speed ratings for this size class — permissible speed follows the application heat balance." }, { "q": "Why does C4024-K30V-VE240-AH24024 list a 115 mm shaft size when the bearing bore is 120 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 24024 has a tapered outside that engages the bearing's 120 mm tapered bore and a cylindrical bore that seats on the 115 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C4024-K30V-VE240-AH24024 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 4024 K30V/VE240 and the sleeve AH 24024 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C4024-K30V-VE240-AH24024 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C4024-K30V-VE240-AH24024 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 24024 is driven or pressed to a marked travel on the 115 mm seat, which sets the interference into the 120 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C4024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C4024-K30V-VE240-AH24024", "SKF C 4024 K30V/VE240 + AH 24024", "C 4024 K30V/VE240 + AH 24024", "C 4024 K30V/VE240", "AH 24024" ], "locale_variants": {}, "limiting_speed_rpm": 1400, "max_rpm": 1400 }, { "sku": "C4026-K30-AH24026", "brand": "SKF", "manufacturer_designation": "SKF C 4026 K30 + AH 24026", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 125, "D_mm": 200, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 620, "static_load_kN": 930, "fatigue_load_limit_kN": 93, "weight_g": 8700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Record the sleeve travel at mounting of C4026-K30-AH24026: the clearance set into the 130 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 125 mm shaft over the years. Spare-parts note: order C4026-K30-AH24026 as the unit; a bare C 4026 K30 plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.For a 125 mm shaft SKF lists C4026-K30-AH24026 as the complete unit: CARB bearing C 4026 K30 plus withdrawal sleeve AH 24026, one catalogue entry covering both components.The code breaks into bearing C 4026 K30 and withdrawal sleeve AH 24026: C marks the CARB type, the digit group the 130 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C4026-K30-AH24026. Why a withdrawal sleeve at 125 mm shaft: adapter-sleeve locknut forces become impractical on the 130 mm bore; the AH 24026 execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. Fatigue floor: Pu 93 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 4026 K30 bearing — the sleeve execution does not change the L10 arithmetic.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C4026-K30-AH24026 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Sleeve and bearing are a matched taper pair: never fit sleeve AH 24026 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C4026-K30-AH24026 unit — replace the sleeve with the bearing.", "The 620/930 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 4026 K30 + AH 24026 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C4026-K30-AH24026?", "a": "The unit is CARB bearing C 4026 K30 on withdrawal sleeve AH 24026, fitting a 125 mm shaft (4.921 in), housing bore 200 mm, bearing width 69 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 620 kN, C0 930 kN, fatigue load limit Pu 93 kN, combined mass about 8.7 kg. Reference speed 2,200 r/min, limiting speed 2,800 r/min (bearing values)." }, { "q": "Why does C4026-K30-AH24026 list a 125 mm shaft size when the bearing bore is 130 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 24026 has a tapered outside that engages the bearing's 130 mm tapered bore and a cylindrical bore that seats on the 125 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C4026-K30-AH24026 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 4026 K30 and the sleeve AH 24026 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C4026-K30-AH24026 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C4026-K30-AH24026 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 24026 is driven or pressed to a marked travel on the 125 mm seat, which sets the interference into the 130 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C4026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C4026-K30-AH24026", "SKF C 4026 K30 + AH 24026", "C 4026 K30 + AH 24026", "C 4026 K30", "AH 24026" ], "locale_variants": {}, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "max_rpm": 2800 }, { "sku": "C4028-K30V-AH24028", "brand": "SKF", "manufacturer_designation": "SKF C 4028 K30V + AH 24028", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 135, "D_mm": 210, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 750, "static_load_kN": 1220, "fatigue_load_limit_kN": 120, "weight_g": 9500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Record the sleeve travel at mounting of C4028-K30V-AH24028: the clearance set into the 140 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 135 mm shaft over the years. Housing side of C4028-K30V-AH24028 is conventional: a 210 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 135 mm shaft.In SKF catalogue PUB BU/P1 17000, C4028-K30V-AH24028 appears as bearing C 4028 K30V + withdrawal sleeve AH 24028 — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 10 kg.Reading the designation: C 4028 K30V is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the withdrawal sleeve AH 24028 carries the tapered bore seat on a 135 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore. Withdrawal sleeve AH 24028: at this size the sleeve is pulled onto the 135 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 140 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. The C0/C balance of about 1.63 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Do not run C4028-K30V-AH24028 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C4028-K30V-AH24028 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C4028-K30V-AH24028 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 750/1220 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 4028 K30V + AH 24028 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C4028-K30V-AH24028?", "a": "The unit is CARB bearing C 4028 K30V on withdrawal sleeve AH 24028, fitting a 135 mm shaft (5.315 in), housing bore 210 mm, bearing width 69 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 750 kN, C0 1220 kN, fatigue load limit Pu 120 kN, combined mass about 9.5 kg. The catalogue lists no speed ratings for this size class — permissible speed follows the application heat balance." }, { "q": "Why does C4028-K30V-AH24028 list a 135 mm shaft size when the bearing bore is 140 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 24028 has a tapered outside that engages the bearing's 140 mm tapered bore and a cylindrical bore that seats on the 135 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C4028-K30V-AH24028 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 4028 K30V and the sleeve AH 24028 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C4028-K30V-AH24028 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C4028-K30V-AH24028 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 24028 is driven or pressed to a marked travel on the 135 mm seat, which sets the interference into the 140 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C4028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C4028-K30V-AH24028", "SKF C 4028 K30V + AH 24028", "C 4028 K30V + AH 24028", "C 4028 K30V", "AH 24028" ], "locale_variants": {}, "limiting_speed_rpm": 800, "max_rpm": 800 }, { "sku": "C3030-KV-AHX3030", "brand": "SKF", "manufacturer_designation": "SKF C 3030 KV + AHX 3030", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 145, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 585, "static_load_kN": 960, "fatigue_load_limit_kN": 93, "weight_g": 8900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 145 mm shaft SKF lists C3030-KV-AHX3030 as the complete unit: CARB bearing C 3030 KV plus withdrawal sleeve AHX 3030, one catalogue entry covering both components.Reading the designation: C 3030 KV is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the withdrawal sleeve AHX 3030 carries the tapered bore seat on a 145 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore. Sleeve discipline for AHX 3030: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution. The C0/C balance of about 1.64 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Mounting C3030-KV-AHX3030 at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 145 mm seat and verify the residual radial clearance of the 150 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. Housing side of C3030-KV-AHX3030 is conventional: a 225 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 145 mm shaft.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Never set C3030-KV-AHX3030 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 150 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3030-KV-AHX3030 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Protect the 145 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3030-KV-AHX3030.", "The 585/960 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3030 KV + AHX 3030 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3030-KV-AHX3030?", "a": "The unit is CARB bearing C 3030 KV on withdrawal sleeve AHX 3030, fitting a 145 mm shaft (5.709 in), housing bore 225 mm, bearing width 56 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 585 kN, C0 960 kN, fatigue load limit Pu 93 kN, combined mass about 8.9 kg. The catalogue lists no speed ratings for this size class — permissible speed follows the application heat balance." }, { "q": "Why does C3030-KV-AHX3030 list a 145 mm shaft size when the bearing bore is 150 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AHX 3030 has a tapered outside that engages the bearing's 150 mm tapered bore and a cylindrical bore that seats on the 145 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3030-KV-AHX3030 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3030 KV and the sleeve AHX 3030 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3030-KV-AHX3030 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3030-KV-AHX3030 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AHX 3030 is driven or pressed to a marked travel on the 145 mm seat, which sets the interference into the 150 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3030-KV-AHX3030", "SKF C 3030 KV + AHX 3030", "C 3030 KV + AHX 3030", "C 3030 KV", "AHX 3030" ], "locale_variants": {}, "limiting_speed_rpm": 1000, "max_rpm": 1000 }, { "sku": "C4032-K30-AH24032", "brand": "SKF", "manufacturer_designation": "SKF C 4032 K30 + AH 24032", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 150, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 765, "static_load_kN": 1160, "fatigue_load_limit_kN": 110, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Spare-parts note: order C4032-K30-AH24032 as the unit; a bare C 4032 K30 plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.In SKF catalogue PUB BU/P1 17000, C4032-K30-AH24032 appears as bearing C 4032 K30 + withdrawal sleeve AH 24032 — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 15 kg.On the SKF nameplate, C4032-K30-AH24032 reads as two catalogued components: the CARB bearing C 4032 K30 with its 160 mm tapered (K) bore, and the withdrawal sleeve AH 24032 whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 150 mm shaft size. Withdrawal sleeve AH 24032: at this size the sleeve is pulled onto the 150 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 160 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. Speed note: for C4032-K30-AH24032 the CARB table lists 1,700 r/min reference and 2,400 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 150 mm seat. Record the sleeve travel at mounting of C4032-K30-AH24032: the clearance set into the 160 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 150 mm shaft over the years.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C4032-K30-AH24032 unit — replace the sleeve with the bearing.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C4032-K30-AH24032 unit — replace the sleeve with the bearing.", "Never set C4032-K30-AH24032 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 160 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 765/1160 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 4032 K30 + AH 24032 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C4032-K30-AH24032?", "a": "The unit is CARB bearing C 4032 K30 on withdrawal sleeve AH 24032, fitting a 150 mm shaft (5.906 in), housing bore 240 mm, bearing width 80 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 765 kN, C0 1160 kN, fatigue load limit Pu 110 kN, combined mass about 14.5 kg. Reference speed 1,700 r/min, limiting speed 2,400 r/min (bearing values)." }, { "q": "Why does C4032-K30-AH24032 list a 150 mm shaft size when the bearing bore is 160 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 24032 has a tapered outside that engages the bearing's 160 mm tapered bore and a cylindrical bore that seats on the 150 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C4032-K30-AH24032 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 4032 K30 and the sleeve AH 24032 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C4032-K30-AH24032 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C4032-K30-AH24032 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 24032 is driven or pressed to a marked travel on the 150 mm seat, which sets the interference into the 160 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C4032", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C4032-K30-AH24032", "SKF C 4032 K30 + AH 24032", "C 4032 K30 + AH 24032", "C 4032 K30", "AH 24032" ], "locale_variants": {}, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "max_rpm": 2400 }, { "sku": "C4034-K30V-AH24034", "brand": "SKF", "manufacturer_designation": "SKF C 4034 K30V + AH 24034", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 160, "D_mm": 260, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1140, "static_load_kN": 1860, "fatigue_load_limit_kN": 173, "weight_g": 20000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Housing side of C4034-K30V-AH24034 is conventional: a 260 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 160 mm shaft.For a 160 mm shaft SKF lists C4034-K30V-AH24034 as the complete unit: CARB bearing C 4034 K30V plus withdrawal sleeve AH 24034, one catalogue entry covering both components.The code breaks into bearing C 4034 K30V and withdrawal sleeve AH 24034: C marks the CARB type, the digit group the 170 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C4034-K30V-AH24034. Withdrawal sleeve AH 24034: at this size the sleeve is pulled onto the 160 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 170 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. Speed note: no catalogue speed rating exists for this size class the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 160 mm seat. Dismounting uses the withdrawal thread on AH 24034: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 160 mm seat as one piece and the seat stays undamaged.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Never set C4034-K30V-AH24034 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 170 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Protect the 160 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C4034-K30V-AH24034.", "Do not run C4034-K30V-AH24034 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 1140/1860 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 4034 K30V + AH 24034 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C4034-K30V-AH24034?", "a": "The unit is CARB bearing C 4034 K30V on withdrawal sleeve AH 24034, fitting a 160 mm shaft (6.299 in), housing bore 260 mm, bearing width 90 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1140 kN, C0 1860 kN, fatigue load limit Pu 173 kN, combined mass about 20.0 kg. The catalogue lists no speed ratings for this size class — permissible speed follows the application heat balance." }, { "q": "Why does C4034-K30V-AH24034 list a 160 mm shaft size when the bearing bore is 170 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 24034 has a tapered outside that engages the bearing's 170 mm tapered bore and a cylindrical bore that seats on the 160 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C4034-K30V-AH24034 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 4034 K30V and the sleeve AH 24034 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C4034-K30V-AH24034 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C4034-K30V-AH24034 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 24034 is driven or pressed to a marked travel on the 160 mm seat, which sets the interference into the 170 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C4034", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C4034-K30V-AH24034", "SKF C 4034 K30V + AH 24034", "C 4034 K30V + AH 24034", "C 4034 K30V", "AH 24034" ], "locale_variants": {}, "limiting_speed_rpm": 500, "max_rpm": 500 }, { "sku": "C3036-K-AH3036", "brand": "SKF", "manufacturer_designation": "SKF C 3036 K + AH 3036", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 170, "D_mm": 280, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 880, "static_load_kN": 1340, "fatigue_load_limit_kN": 122, "weight_g": 19000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Fatigue floor: Pu 122 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3036 K bearing — the sleeve execution does not change the L10 arithmetic. Dismounting uses the withdrawal thread on AH 3036: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 170 mm seat as one piece and the seat stays undamaged. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3036 K and AH 3036 must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C3036-K-AH3036 appears as bearing C 3036 K + withdrawal sleeve AH 3036 — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 19 kg.Reading the designation: C 3036 K is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the withdrawal sleeve AH 3036 carries the tapered bore seat on a 170 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore. The AH 3036 execution defines the fit on the 170 mm cylindrical seat by sleeve travel rather than locknut torque; the mounting procedure records that travel, because the running clearance of the CARB bearing is set by the same taper.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Do not run C3036-K-AH3036 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C3036-K-AH3036 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3036-K-AH3036 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 880/1340 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3036 K + AH 3036 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3036-K-AH3036?", "a": "The unit is CARB bearing C 3036 K on withdrawal sleeve AH 3036, fitting a 170 mm shaft (6.693 in), housing bore 280 mm, bearing width 74 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 880 kN, C0 1340 kN, fatigue load limit Pu 122 kN, combined mass about 19.0 kg. Reference speed 2,000 r/min, limiting speed 2,600 r/min (bearing values)." }, { "q": "Why does C3036-K-AH3036 list a 170 mm shaft size when the bearing bore is 180 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 3036 has a tapered outside that engages the bearing's 180 mm tapered bore and a cylindrical bore that seats on the 170 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3036-K-AH3036 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3036 K and the sleeve AH 3036 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3036-K-AH3036 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3036-K-AH3036 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 3036 is driven or pressed to a marked travel on the 170 mm seat, which sets the interference into the 180 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3036", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3036-K-AH3036", "SKF C 3036 K + AH 3036", "C 3036 K + AH 3036", "C 3036 K", "AH 3036" ], "locale_variants": {}, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "max_rpm": 2600 }, { "sku": "C3038-K-AH3038-G", "brand": "SKF", "manufacturer_designation": "SKF C 3038 K + AH 3038 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 180, "D_mm": 290, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 930, "static_load_kN": 1460, "fatigue_load_limit_kN": 132, "weight_g": 20500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C3038-K-AH3038-G appears as bearing C 3038 K + withdrawal sleeve AH 3038 G — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 21 kg.Digit by digit, C3038-K-AH3038-G = CARB bearing C 3038 K (190 mm bore, 290 mm OD, 75 mm width) + withdrawal sleeve AH 3038 G for the 180 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Withdrawal sleeve AH 3038 G: at this size the sleeve is pulled onto the 180 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 190 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. Dividing C 930 kN by the 190 mm bore gives 4.89 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 180 mm seat is fixed and the life requirement is not. Record the sleeve travel at mounting of C3038-K-AH3038-G: the clearance set into the 190 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 180 mm shaft over the years. Spare-parts note: order C3038-K-AH3038-G as the unit; a bare C 3038 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3038-K-AH3038-G and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Do not run C3038-K-AH3038-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Keep the pair complete in stores: storing bearing C 3038 K and sleeve AH 3038 G on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "The 930/1460 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3038 K + AH 3038 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3038-K-AH3038-G?", "a": "The unit is CARB bearing C 3038 K on withdrawal sleeve AH 3038 G, fitting a 180 mm shaft (7.087 in), housing bore 290 mm, bearing width 75 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 930 kN, C0 1460 kN, fatigue load limit Pu 132 kN, combined mass about 20.5 kg. Reference speed 1,800 r/min, limiting speed 2,400 r/min (bearing values)." }, { "q": "Why does C3038-K-AH3038-G list a 180 mm shaft size when the bearing bore is 190 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 3038 G has a tapered outside that engages the bearing's 190 mm tapered bore and a cylindrical bore that seats on the 180 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3038-K-AH3038-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3038 K and the sleeve AH 3038 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3038-K-AH3038-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3038-K-AH3038-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 3038 G is driven or pressed to a marked travel on the 180 mm seat, which sets the interference into the 190 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3038", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3038-K-AH3038-G", "SKF C 3038 K + AH 3038 G", "C 3038 K + AH 3038 G", "C 3038 K", "AH 3038 G" ], "locale_variants": {}, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "max_rpm": 2400 }, { "sku": "C3040-K-AH3040-G", "brand": "SKF", "manufacturer_designation": "SKF C 3040 K + AH 3040 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 190, "D_mm": 310, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1120, "static_load_kN": 1730, "fatigue_load_limit_kN": 153, "weight_g": 25500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Dismounting uses the withdrawal thread on AH 3040 G: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 190 mm seat as one piece and the seat stays undamaged. Housing side of C3040-K-AH3040-G is conventional: a 310 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 190 mm shaft.The C3040-K-AH3040-G unit combines the 200 mm-bore CARB toroidal roller bearing C 3040 K with withdrawal sleeve AH 3040 G, giving controlled mounting interference on a plain 190 mm cylindrical seat.Numbering logic: the bearing half C 3040 K follows the CARB works numbering (type C, dimension series, 200 mm bore), while AH 3040 G identifies the sleeve execution for that bore; the combo C3040-K-AH3040-G exists in the catalogue so that shaft (190 mm), housing (310 mm) and both components are specified with one order number. Combined mass of the unit — bearing C 3040 K plus sleeve AH 3040 G — is about 26 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. The C0/C balance of about 1.54 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 3040 K and sleeve AH 3040 G on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Keep the pair complete in stores: storing bearing C 3040 K and sleeve AH 3040 G on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Never set C3040-K-AH3040-G by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 200 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 1120/1730 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3040 K + AH 3040 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3040-K-AH3040-G?", "a": "The unit is CARB bearing C 3040 K on withdrawal sleeve AH 3040 G, fitting a 190 mm shaft (7.48 in), housing bore 310 mm, bearing width 82 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1120 kN, C0 1730 kN, fatigue load limit Pu 153 kN, combined mass about 25.5 kg. Reference speed 1,700 r/min, limiting speed 2,400 r/min (bearing values)." }, { "q": "Why does C3040-K-AH3040-G list a 190 mm shaft size when the bearing bore is 200 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AH 3040 G has a tapered outside that engages the bearing's 200 mm tapered bore and a cylindrical bore that seats on the 190 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3040-K-AH3040-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3040 K and the sleeve AH 3040 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3040-K-AH3040-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3040-K-AH3040-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AH 3040 G is driven or pressed to a marked travel on the 190 mm seat, which sets the interference into the 200 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3040", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3040-K-AH3040-G", "SKF C 3040 K + AH 3040 G", "C 3040 K + AH 3040 G", "C 3040 K", "AH 3040 G" ], "locale_variants": {}, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "max_rpm": 2400 }, { "sku": "C3044-K-AOH3044-G", "brand": "SKF", "manufacturer_designation": "SKF C 3044 K + AOH 3044 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 200, "D_mm": 340, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1320, "static_load_kN": 2040, "fatigue_load_limit_kN": 176, "weight_g": 36000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Digit by digit, C3044-K-AOH3044-G = CARB bearing C 3044 K (220 mm bore, 340 mm OD, 90 mm width) + withdrawal sleeve AOH 3044 G for the 200 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Sleeve discipline for AOH 3044 G: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution. Speed note: for C3044-K-AOH3044-G the CARB table lists 1,600 r/min reference and 2,200 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 200 mm seat. Dismounting uses the withdrawal thread on AOH 3044 G: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 200 mm seat as one piece and the seat stays undamaged. Spare-parts note: order C3044-K-AOH3044-G as the unit; a bare C 3044 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.SKF C 3044 K + AOH 3044 G denotes bearing C 3044 K mounted on withdrawal sleeve AOH 3044 G: a 200 mm shaft seat, 340 mm housing bore, and the sleeve providing the interference a 220 mm tapered bore needs.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3044-K-AOH3044-G and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3044-K-AOH3044-G and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Sleeve and bearing are a matched taper pair: never fit sleeve AOH 3044 G onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 1320/2040 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3044 K + AOH 3044 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3044-K-AOH3044-G?", "a": "The unit is CARB bearing C 3044 K on withdrawal sleeve AOH 3044 G, fitting a 200 mm shaft (7.874 in), housing bore 340 mm, bearing width 90 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1320 kN, C0 2040 kN, fatigue load limit Pu 176 kN, combined mass about 36.0 kg. Reference speed 1,600 r/min, limiting speed 2,200 r/min (bearing values)." }, { "q": "Why does C3044-K-AOH3044-G list a 200 mm shaft size when the bearing bore is 220 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3044 G has a tapered outside that engages the bearing's 220 mm tapered bore and a cylindrical bore that seats on the 200 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3044-K-AOH3044-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3044 K and the sleeve AOH 3044 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3044-K-AOH3044-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3044-K-AOH3044-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3044 G is driven or pressed to a marked travel on the 200 mm seat, which sets the interference into the 220 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3044", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3044-K-AOH3044-G", "SKF C 3044 K + AOH 3044 G", "C 3044 K + AOH 3044 G", "C 3044 K", "AOH 3044 G" ], "locale_variants": {}, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "max_rpm": 2200 }, { "sku": "C3048-K-AOH3048", "brand": "SKF", "manufacturer_designation": "SKF C 3048 K + AOH 3048", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 220, "D_mm": 360, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1340, "static_load_kN": 2160, "fatigue_load_limit_kN": 183, "weight_g": 39500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Dismounting uses the withdrawal thread on AOH 3048: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 220 mm seat as one piece and the seat stays undamaged. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3048 K and AOH 3048 must be checked against the application temperature before substitution.C3048-K-AOH3048 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 3048 K on withdrawal sleeve AOH 3048, listed in SKF catalogue PUB BU/P1 17000 for a 220 mm shaft seat.The code breaks into bearing C 3048 K and withdrawal sleeve AOH 3048: C marks the CARB type, the digit group the 240 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C3048-K-AOH3048. Combined mass of the unit — bearing C 3048 K plus sleeve AOH 3048 — is about 40 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. Dividing C 1340 kN by the 240 mm bore gives 5.58 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 220 mm seat is fixed and the life requirement is not.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Never set C3048-K-AOH3048 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 240 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3048-K-AOH3048 unit — replace the sleeve with the bearing.", "Sleeve and bearing are a matched taper pair: never fit sleeve AOH 3048 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 1340/2160 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3048 K + AOH 3048 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3048-K-AOH3048?", "a": "The unit is CARB bearing C 3048 K on withdrawal sleeve AOH 3048, fitting a 220 mm shaft (8.661 in), housing bore 360 mm, bearing width 92 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1340 kN, C0 2160 kN, fatigue load limit Pu 183 kN, combined mass about 39.5 kg. Reference speed 1,500 r/min, limiting speed 2,000 r/min (bearing values)." }, { "q": "Why does C3048-K-AOH3048 list a 220 mm shaft size when the bearing bore is 240 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3048 has a tapered outside that engages the bearing's 240 mm tapered bore and a cylindrical bore that seats on the 220 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3048-K-AOH3048 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3048 K and the sleeve AOH 3048 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3048-K-AOH3048 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3048-K-AOH3048 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3048 is driven or pressed to a marked travel on the 220 mm seat, which sets the interference into the 240 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3048-K-AOH3048", "SKF C 3048 K + AOH 3048", "C 3048 K + AOH 3048", "C 3048 K", "AOH 3048" ], "locale_variants": {}, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "max_rpm": 2000 }, { "sku": "C3052-K-AOH3052", "brand": "SKF", "manufacturer_designation": "SKF C 3052 K + AOH 3052", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 240, "D_mm": 400, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1760, "static_load_kN": 2850, "fatigue_load_limit_kN": 232, "weight_g": 55500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Mounting C3052-K-AOH3052 at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 240 mm seat and verify the residual radial clearance of the 260 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. Housing side of C3052-K-AOH3052 is conventional: a 400 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 240 mm shaft.SKF C 3052 K + AOH 3052 denotes bearing C 3052 K mounted on withdrawal sleeve AOH 3052: a 240 mm shaft seat, 400 mm housing bore, and the sleeve providing the interference a 260 mm tapered bore needs.Digit by digit, C3052-K-AOH3052 = CARB bearing C 3052 K (260 mm bore, 400 mm OD, 104 mm width) + withdrawal sleeve AOH 3052 for the 240 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Sleeve discipline for AOH 3052: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution. With a combined mass of 55.5 kg over the 240×400×104 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 3052 K and sleeve AOH 3052 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3052-K-AOH3052 unit — replace the sleeve with the bearing.", "Never set C3052-K-AOH3052 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 260 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 1760/2850 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3052 K + AOH 3052 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3052-K-AOH3052?", "a": "The unit is CARB bearing C 3052 K on withdrawal sleeve AOH 3052, fitting a 240 mm shaft (9.449 in), housing bore 400 mm, bearing width 104 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1760 kN, C0 2850 kN, fatigue load limit Pu 232 kN, combined mass about 55.5 kg. Reference speed 1,300 r/min, limiting speed 1,800 r/min (bearing values)." }, { "q": "Why does C3052-K-AOH3052 list a 240 mm shaft size when the bearing bore is 260 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3052 has a tapered outside that engages the bearing's 260 mm tapered bore and a cylindrical bore that seats on the 240 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3052-K-AOH3052 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3052 K and the sleeve AOH 3052 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3052-K-AOH3052 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3052-K-AOH3052 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3052 is driven or pressed to a marked travel on the 240 mm seat, which sets the interference into the 260 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3052-K-AOH3052", "SKF C 3052 K + AOH 3052", "C 3052 K + AOH 3052", "C 3052 K", "AOH 3052" ], "locale_variants": {}, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1800, "max_rpm": 1800 }, { "sku": "C3056-K-AOH3056", "brand": "SKF", "manufacturer_designation": "SKF C 3056 K + AOH 3056", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 260, "D_mm": 420, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1860, "static_load_kN": 3100, "fatigue_load_limit_kN": 250, "weight_g": 61000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The C0/C balance of about 1.67 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Record the sleeve travel at mounting of C3056-K-AOH3056: the clearance set into the 280 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 260 mm shaft over the years. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3056 K and AOH 3056 must be checked against the application temperature before substitution.C3056-K-AOH3056 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 3056 K on withdrawal sleeve AOH 3056, listed in SKF catalogue PUB BU/P1 17000 for a 260 mm shaft seat.The code breaks into bearing C 3056 K and withdrawal sleeve AOH 3056: C marks the CARB type, the digit group the 280 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C3056-K-AOH3056. Why a withdrawal sleeve at 260 mm shaft: adapter-sleeve locknut forces become impractical on the 280 mm bore; the AOH 3056 execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Never set C3056-K-AOH3056 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 280 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Protect the 260 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3056-K-AOH3056.", "Never set C3056-K-AOH3056 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 280 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 1860/3100 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3056 K + AOH 3056 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3056-K-AOH3056?", "a": "The unit is CARB bearing C 3056 K on withdrawal sleeve AOH 3056, fitting a 260 mm shaft (10.236 in), housing bore 420 mm, bearing width 106 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1860 kN, C0 3100 kN, fatigue load limit Pu 250 kN, combined mass about 61.0 kg. Reference speed 1,200 r/min, limiting speed 1,600 r/min (bearing values)." }, { "q": "Why does C3056-K-AOH3056 list a 260 mm shaft size when the bearing bore is 280 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3056 has a tapered outside that engages the bearing's 280 mm tapered bore and a cylindrical bore that seats on the 260 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3056-K-AOH3056 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3056 K and the sleeve AOH 3056 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3056-K-AOH3056 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3056-K-AOH3056 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3056 is driven or pressed to a marked travel on the 260 mm seat, which sets the interference into the 280 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3056-K-AOH3056", "SKF C 3056 K + AOH 3056", "C 3056 K + AOH 3056", "C 3056 K", "AOH 3056" ], "locale_variants": {}, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1600, "max_rpm": 1600 }, { "sku": "C3060-KM-AOH3060", "brand": "SKF", "manufacturer_designation": "SKF C 3060 KM + AOH 3060", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 280, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2160, "static_load_kN": 3750, "fatigue_load_limit_kN": 290, "weight_g": 84000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The AOH 3060 execution defines the fit on the 280 mm cylindrical seat by sleeve travel rather than locknut torque; the mounting procedure records that travel, because the running clearance of the CARB bearing is set by the same taper. The C0/C balance of about 1.74 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Record the sleeve travel at mounting of C3060-KM-AOH3060: the clearance set into the 300 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 280 mm shaft over the years. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3060 KM and AOH 3060 must be checked against the application temperature before substitution.C3060-KM-AOH3060 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 3060 KM on withdrawal sleeve AOH 3060, listed in SKF catalogue PUB BU/P1 17000 for a 280 mm shaft seat.Digit by digit, C3060-KM-AOH3060 = CARB bearing C 3060 KM (300 mm bore, 460 mm OD, 118 mm width) + withdrawal sleeve AOH 3060 for the 280 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 3060 KM and sleeve AOH 3060 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3060-KM-AOH3060 unit — replace the sleeve with the bearing.", "Never set C3060-KM-AOH3060 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 300 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 2160/3750 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3060 KM + AOH 3060 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3060-KM-AOH3060?", "a": "The unit is CARB bearing C 3060 KM on withdrawal sleeve AOH 3060, fitting a 280 mm shaft (11.024 in), housing bore 460 mm, bearing width 118 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2160 kN, C0 3750 kN, fatigue load limit Pu 290 kN, combined mass about 84.0 kg. Reference speed 1,100 r/min, limiting speed 1,500 r/min (bearing values)." }, { "q": "Why does C3060-KM-AOH3060 list a 280 mm shaft size when the bearing bore is 300 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3060 has a tapered outside that engages the bearing's 300 mm tapered bore and a cylindrical bore that seats on the 280 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3060-KM-AOH3060 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3060 KM and the sleeve AOH 3060 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3060-KM-AOH3060 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3060-KM-AOH3060 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3060 is driven or pressed to a marked travel on the 280 mm seat, which sets the interference into the 300 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3060", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3060-KM-AOH3060", "SKF C 3060 KM + AOH 3060", "C 3060 KM + AOH 3060", "C 3060 KM", "AOH 3060" ], "locale_variants": {}, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "max_rpm": 1500 }, { "sku": "C3064-KM-AOH3064-G", "brand": "SKF", "manufacturer_designation": "SKF C 3064 KM + AOH 3064 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 300, "D_mm": 480, "B_mm": 121, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2280, "static_load_kN": 4000, "fatigue_load_limit_kN": 305, "weight_g": 93000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Numbering logic: the bearing half C 3064 KM follows the CARB works numbering (type C, dimension series, 320 mm bore), while AOH 3064 G identifies the sleeve execution for that bore; the combo C3064-KM-AOH3064-G exists in the catalogue so that shaft (300 mm), housing (480 mm) and both components are specified with one order number. Combined mass of the unit — bearing C 3064 KM plus sleeve AOH 3064 G — is about 93 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. Fatigue floor: Pu 305 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3064 KM bearing — the sleeve execution does not change the L10 arithmetic. Dismounting uses the withdrawal thread on AOH 3064 G: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 300 mm seat as one piece and the seat stays undamaged. Spare-parts note: order C3064-KM-AOH3064-G as the unit; a bare C 3064 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.For a 300 mm shaft SKF lists C3064-KM-AOH3064-G as the complete unit: CARB bearing C 3064 KM plus withdrawal sleeve AOH 3064 G, one catalogue entry covering both components.", "applications": [ "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "continuous-caster guide rolls and slab-caster segments under heat growth" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 3064 KM and sleeve AOH 3064 G on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3064-KM-AOH3064-G unit — replace the sleeve with the bearing.", "Protect the 300 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3064-KM-AOH3064-G.", "The 2280/4000 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3064 KM + AOH 3064 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3064-KM-AOH3064-G?", "a": "The unit is CARB bearing C 3064 KM on withdrawal sleeve AOH 3064 G, fitting a 300 mm shaft (11.811 in), housing bore 480 mm, bearing width 121 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2280 kN, C0 4000 kN, fatigue load limit Pu 305 kN, combined mass about 93.0 kg. Reference speed 1,000 r/min, limiting speed 1,400 r/min (bearing values)." }, { "q": "Why does C3064-KM-AOH3064-G list a 300 mm shaft size when the bearing bore is 320 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3064 G has a tapered outside that engages the bearing's 320 mm tapered bore and a cylindrical bore that seats on the 300 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3064-KM-AOH3064-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3064 KM and the sleeve AOH 3064 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3064-KM-AOH3064-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3064-KM-AOH3064-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3064 G is driven or pressed to a marked travel on the 300 mm seat, which sets the interference into the 320 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3064", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3064-KM-AOH3064-G", "SKF C 3064 KM + AOH 3064 G", "C 3064 KM + AOH 3064 G", "C 3064 KM", "AOH 3064 G" ], "locale_variants": {}, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "max_rpm": 1400 }, { "sku": "C3068-KM-AOH3068-G", "brand": "SKF", "manufacturer_designation": "SKF C 3068 KM + AOH 3068 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 320, "D_mm": 520, "B_mm": 133, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2900, "static_load_kN": 5000, "fatigue_load_limit_kN": 375, "weight_g": 120000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " With a combined mass of 120.0 kg over the 320×520×133 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Mounting C3068-KM-AOH3068-G at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 320 mm seat and verify the residual radial clearance of the 340 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3068 KM and AOH 3068 G must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C3068-KM-AOH3068-G appears as bearing C 3068 KM + withdrawal sleeve AOH 3068 G — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 120 kg.Numbering logic: the bearing half C 3068 KM follows the CARB works numbering (type C, dimension series, 340 mm bore), while AOH 3068 G identifies the sleeve execution for that bore; the combo C3068-KM-AOH3068-G exists in the catalogue so that shaft (320 mm), housing (520 mm) and both components are specified with one order number. Sleeve discipline for AOH 3068 G: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Do not run C3068-KM-AOH3068-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C3068-KM-AOH3068-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3068-KM-AOH3068-G unit — replace the sleeve with the bearing.", "The 2900/5000 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3068 KM + AOH 3068 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3068-KM-AOH3068-G?", "a": "The unit is CARB bearing C 3068 KM on withdrawal sleeve AOH 3068 G, fitting a 320 mm shaft (12.598 in), housing bore 520 mm, bearing width 133 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2900 kN, C0 5000 kN, fatigue load limit Pu 375 kN, combined mass about 120.0 kg. Reference speed 950 r/min, limiting speed 1,300 r/min (bearing values)." }, { "q": "Why does C3068-KM-AOH3068-G list a 320 mm shaft size when the bearing bore is 340 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3068 G has a tapered outside that engages the bearing's 340 mm tapered bore and a cylindrical bore that seats on the 320 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3068-KM-AOH3068-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3068 KM and the sleeve AOH 3068 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3068-KM-AOH3068-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3068-KM-AOH3068-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3068 G is driven or pressed to a marked travel on the 320 mm seat, which sets the interference into the 340 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3068", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3068-KM-AOH3068-G", "SKF C 3068 KM + AOH 3068 G", "C 3068 KM + AOH 3068 G", "C 3068 KM", "AOH 3068 G" ], "locale_variants": {}, "reference_speed_rpm": 950, "limiting_speed_rpm": 1300, "max_rpm": 1300 }, { "sku": "C3072-KM-AOH3072-G", "brand": "SKF", "manufacturer_designation": "SKF C 3072 KM + AOH 3072 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 340, "D_mm": 540, "B_mm": 134, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2900, "static_load_kN": 5000, "fatigue_load_limit_kN": 375, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Digit by digit, C3072-KM-AOH3072-G = CARB bearing C 3072 KM (360 mm bore, 540 mm OD, 134 mm width) + withdrawal sleeve AOH 3072 G for the 340 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Why a withdrawal sleeve at 340 mm shaft: adapter-sleeve locknut forces become impractical on the 360 mm bore; the AOH 3072 G execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. Speed note: for C3072-KM-AOH3072-G the CARB table lists 900 r/min reference and 1,300 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 340 mm seat. Mounting C3072-KM-AOH3072-G at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 340 mm seat and verify the residual radial clearance of the 360 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. Spare-parts note: order C3072-KM-AOH3072-G as the unit; a bare C 3072 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.In SKF catalogue PUB BU/P1 17000, C3072-KM-AOH3072-G appears as bearing C 3072 KM + withdrawal sleeve AOH 3072 G — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 125 kg.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3072-KM-AOH3072-G and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Do not run C3072-KM-AOH3072-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3072-KM-AOH3072-G unit — replace the sleeve with the bearing.", "The 2900/5000 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3072 KM + AOH 3072 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3072-KM-AOH3072-G?", "a": "The unit is CARB bearing C 3072 KM on withdrawal sleeve AOH 3072 G, fitting a 340 mm shaft (13.386 in), housing bore 540 mm, bearing width 134 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2900 kN, C0 5000 kN, fatigue load limit Pu 375 kN, combined mass about 125.0 kg. Reference speed 900 r/min, limiting speed 1,300 r/min (bearing values)." }, { "q": "Why does C3072-KM-AOH3072-G list a 340 mm shaft size when the bearing bore is 360 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3072 G has a tapered outside that engages the bearing's 360 mm tapered bore and a cylindrical bore that seats on the 340 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3072-KM-AOH3072-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3072 KM and the sleeve AOH 3072 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3072-KM-AOH3072-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3072-KM-AOH3072-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3072 G is driven or pressed to a marked travel on the 340 mm seat, which sets the interference into the 360 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3072", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3072-KM-AOH3072-G", "SKF C 3072 KM + AOH 3072 G", "C 3072 KM + AOH 3072 G", "C 3072 KM", "AOH 3072 G" ], "locale_variants": {}, "reference_speed_rpm": 900, "limiting_speed_rpm": 1300, "max_rpm": 1300 }, { "sku": "C3076-KM-AOH3076-G", "brand": "SKF", "manufacturer_designation": "SKF C 3076 KM + AOH 3076 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 360, "D_mm": 560, "B_mm": 135, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3000, "static_load_kN": 5200, "fatigue_load_limit_kN": 380, "weight_g": 130000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Mounting C3076-KM-AOH3076-G at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 360 mm seat and verify the residual radial clearance of the 380 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. Housing side of C3076-KM-AOH3076-G is conventional: a 560 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 360 mm shaft.SKF C 3076 KM + AOH 3076 G denotes bearing C 3076 KM mounted on withdrawal sleeve AOH 3076 G: a 360 mm shaft seat, 560 mm housing bore, and the sleeve providing the interference a 380 mm tapered bore needs.On the SKF nameplate, C3076-KM-AOH3076-G reads as two catalogued components: the CARB bearing C 3076 KM with its 380 mm tapered (K) bore, and the withdrawal sleeve AOH 3076 G whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 360 mm shaft size. Combined mass of the unit — bearing C 3076 KM plus sleeve AOH 3076 G — is about 130 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. Speed note: for C3076-KM-AOH3076-G the CARB table lists 900 r/min reference and 1,200 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 360 mm seat.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Never set C3076-KM-AOH3076-G by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 380 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3076-KM-AOH3076-G unit — replace the sleeve with the bearing.", "Protect the 360 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3076-KM-AOH3076-G.", "The 3000/5200 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3076 KM + AOH 3076 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3076-KM-AOH3076-G?", "a": "The unit is CARB bearing C 3076 KM on withdrawal sleeve AOH 3076 G, fitting a 360 mm shaft (14.173 in), housing bore 560 mm, bearing width 135 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3000 kN, C0 5200 kN, fatigue load limit Pu 380 kN, combined mass about 130.0 kg. Reference speed 900 r/min, limiting speed 1,200 r/min (bearing values)." }, { "q": "Why does C3076-KM-AOH3076-G list a 360 mm shaft size when the bearing bore is 380 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3076 G has a tapered outside that engages the bearing's 380 mm tapered bore and a cylindrical bore that seats on the 360 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3076-KM-AOH3076-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3076 KM and the sleeve AOH 3076 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3076-KM-AOH3076-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3076-KM-AOH3076-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3076 G is driven or pressed to a marked travel on the 360 mm seat, which sets the interference into the 380 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3076", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3076-KM-AOH3076-G", "SKF C 3076 KM + AOH 3076 G", "C 3076 KM + AOH 3076 G", "C 3076 KM", "AOH 3076 G" ], "locale_variants": {}, "reference_speed_rpm": 900, "limiting_speed_rpm": 1200, "max_rpm": 1200 }, { "sku": "C3080-KM-AOH3080-G", "brand": "SKF", "manufacturer_designation": "SKF C 3080 KM + AOH 3080 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 380, "D_mm": 600, "B_mm": 148, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3650, "static_load_kN": 6200, "fatigue_load_limit_kN": 450, "weight_g": 165000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Withdrawal sleeve AOH 3080 G: at this size the sleeve is pulled onto the 380 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 400 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. Dividing C 3650 kN by the 400 mm bore gives 9.13 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 380 mm seat is fixed and the life requirement is not. Mounting C3080-KM-AOH3080-G at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 380 mm seat and verify the residual radial clearance of the 400 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3080 KM and AOH 3080 G must be checked against the application temperature before substitution.SKF C 3080 KM + AOH 3080 G denotes bearing C 3080 KM mounted on withdrawal sleeve AOH 3080 G: a 380 mm shaft seat, 600 mm housing bore, and the sleeve providing the interference a 400 mm tapered bore needs.Numbering logic: the bearing half C 3080 KM follows the CARB works numbering (type C, dimension series, 400 mm bore), while AOH 3080 G identifies the sleeve execution for that bore; the combo C3080-KM-AOH3080-G exists in the catalogue so that shaft (380 mm), housing (600 mm) and both components are specified with one order number.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 3080 KM and sleeve AOH 3080 G on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3080-KM-AOH3080-G unit — replace the sleeve with the bearing.", "Protect the 380 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3080-KM-AOH3080-G.", "The 3650/6200 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3080 KM + AOH 3080 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3080-KM-AOH3080-G?", "a": "The unit is CARB bearing C 3080 KM on withdrawal sleeve AOH 3080 G, fitting a 380 mm shaft (14.961 in), housing bore 600 mm, bearing width 148 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3650 kN, C0 6200 kN, fatigue load limit Pu 450 kN, combined mass about 165.0 kg. Reference speed 800 r/min, limiting speed 1,100 r/min (bearing values)." }, { "q": "Why does C3080-KM-AOH3080-G list a 380 mm shaft size when the bearing bore is 400 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3080 G has a tapered outside that engages the bearing's 400 mm tapered bore and a cylindrical bore that seats on the 380 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3080-KM-AOH3080-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3080 KM and the sleeve AOH 3080 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3080-KM-AOH3080-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3080-KM-AOH3080-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3080 G is driven or pressed to a marked travel on the 380 mm seat, which sets the interference into the 400 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3080", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3080-KM-AOH3080-G", "SKF C 3080 KM + AOH 3080 G", "C 3080 KM + AOH 3080 G", "C 3080 KM", "AOH 3080 G" ], "locale_variants": {}, "reference_speed_rpm": 800, "limiting_speed_rpm": 1100, "max_rpm": 1100 }, { "sku": "C3084-KM-AOH3084-G", "brand": "SKF", "manufacturer_designation": "SKF C 3084 KM + AOH 3084 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 400, "D_mm": 620, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3800, "static_load_kN": 6400, "fatigue_load_limit_kN": 455, "weight_g": 175000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Housing side of C3084-KM-AOH3084-G is conventional: a 620 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 400 mm shaft.For a 400 mm shaft SKF lists C3084-KM-AOH3084-G as the complete unit: CARB bearing C 3084 KM plus withdrawal sleeve AOH 3084 G, one catalogue entry covering both components.The code breaks into bearing C 3084 KM and withdrawal sleeve AOH 3084 G: C marks the CARB type, the digit group the 420 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C3084-KM-AOH3084-G. Why a withdrawal sleeve at 400 mm shaft: adapter-sleeve locknut forces become impractical on the 420 mm bore; the AOH 3084 G execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. The C0/C balance of about 1.68 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Mounting C3084-KM-AOH3084-G at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 400 mm seat and verify the residual radial clearance of the 420 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3084-KM-AOH3084-G unit — replace the sleeve with the bearing.", "Sleeve and bearing are a matched taper pair: never fit sleeve AOH 3084 G onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3084-KM-AOH3084-G unit — replace the sleeve with the bearing.", "The 3800/6400 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3084 KM + AOH 3084 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3084-KM-AOH3084-G?", "a": "The unit is CARB bearing C 3084 KM on withdrawal sleeve AOH 3084 G, fitting a 400 mm shaft (15.748 in), housing bore 620 mm, bearing width 150 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3800 kN, C0 6400 kN, fatigue load limit Pu 455 kN, combined mass about 175.0 kg. Reference speed 800 r/min, limiting speed 1,100 r/min (bearing values)." }, { "q": "Why does C3084-KM-AOH3084-G list a 400 mm shaft size when the bearing bore is 420 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 3084 G has a tapered outside that engages the bearing's 420 mm tapered bore and a cylindrical bore that seats on the 400 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3084-KM-AOH3084-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3084 KM and the sleeve AOH 3084 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3084-KM-AOH3084-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3084-KM-AOH3084-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 3084 G is driven or pressed to a marked travel on the 400 mm seat, which sets the interference into the 420 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3084", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3084-KM-AOH3084-G", "SKF C 3084 KM + AOH 3084 G", "C 3084 KM + AOH 3084 G", "C 3084 KM", "AOH 3084 G" ], "locale_variants": {}, "reference_speed_rpm": 800, "limiting_speed_rpm": 1100, "max_rpm": 1100 }, { "sku": "C3088-KMB-AOHX3088-G", "brand": "SKF", "manufacturer_designation": "SKF C 3088 KMB + AOHX 3088 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 420, "D_mm": 650, "B_mm": 157, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3750, "static_load_kN": 6400, "fatigue_load_limit_kN": 450, "weight_g": 215000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Housing side of C3088-KMB-AOHX3088-G is conventional: a 650 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 420 mm shaft.The C3088-KMB-AOHX3088-G unit combines the 440 mm-bore CARB toroidal roller bearing C 3088 KMB with withdrawal sleeve AOHX 3088 G, giving controlled mounting interference on a plain 420 mm cylindrical seat.The code breaks into bearing C 3088 KMB and withdrawal sleeve AOHX 3088 G: C marks the CARB type, the digit group the 440 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C3088-KMB-AOHX3088-G. Why a withdrawal sleeve at 420 mm shaft: adapter-sleeve locknut forces become impractical on the 440 mm bore; the AOHX 3088 G execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. Selection arithmetic: the unit carries the ratings of its bearing — C 3750 kN, C0 6400 kN, Pu 450 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 420 mm shaft. Dismounting uses the withdrawal thread on AOHX 3088 G: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 420 mm seat as one piece and the seat stays undamaged.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3088-KMB-AOHX3088-G unit — replace the sleeve with the bearing.", "Keep the pair complete in stores: storing bearing C 3088 KMB and sleeve AOHX 3088 G on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not run C3088-KMB-AOHX3088-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 3750/6400 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3088 KMB + AOHX 3088 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3088-KMB-AOHX3088-G?", "a": "The unit is CARB bearing C 3088 KMB on withdrawal sleeve AOHX 3088 G, fitting a 420 mm shaft (16.535 in), housing bore 650 mm, bearing width 157 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3750 kN, C0 6400 kN, fatigue load limit Pu 450 kN, combined mass about 215.0 kg. Reference speed 750 r/min, limiting speed 1,000 r/min (bearing values)." }, { "q": "Why does C3088-KMB-AOHX3088-G list a 420 mm shaft size when the bearing bore is 440 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOHX 3088 G has a tapered outside that engages the bearing's 440 mm tapered bore and a cylindrical bore that seats on the 420 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3088-KMB-AOHX3088-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3088 KMB and the sleeve AOHX 3088 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3088-KMB-AOHX3088-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3088-KMB-AOHX3088-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOHX 3088 G is driven or pressed to a marked travel on the 420 mm seat, which sets the interference into the 440 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3088", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3088-KMB-AOHX3088-G", "SKF C 3088 KMB + AOHX 3088 G", "C 3088 KMB + AOHX 3088 G", "C 3088 KMB", "AOHX 3088 G" ], "locale_variants": {}, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "max_rpm": 1000 }, { "sku": "C3092-KM-AOHX3092-G", "brand": "SKF", "manufacturer_designation": "SKF C 3092 KM + AOHX 3092 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 440, "D_mm": 680, "B_mm": 163, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4000, "static_load_kN": 7500, "fatigue_load_limit_kN": 520, "weight_g": 230000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Housing side of C3092-KM-AOHX3092-G is conventional: a 680 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 440 mm shaft.SKF C 3092 KM + AOHX 3092 G denotes bearing C 3092 KM mounted on withdrawal sleeve AOHX 3092 G: a 440 mm shaft seat, 680 mm housing bore, and the sleeve providing the interference a 460 mm tapered bore needs.The code breaks into bearing C 3092 KM and withdrawal sleeve AOHX 3092 G: C marks the CARB type, the digit group the 460 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C3092-KM-AOHX3092-G. Why a withdrawal sleeve at 440 mm shaft: adapter-sleeve locknut forces become impractical on the 460 mm bore; the AOHX 3092 G execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. The C0/C balance of about 1.88 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Record the sleeve travel at mounting of C3092-KM-AOHX3092-G: the clearance set into the 460 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 440 mm shaft over the years.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3092-KM-AOHX3092-G and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Sleeve and bearing are a matched taper pair: never fit sleeve AOHX 3092 G onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3092-KM-AOHX3092-G and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 4000/7500 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3092 KM + AOHX 3092 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3092-KM-AOHX3092-G?", "a": "The unit is CARB bearing C 3092 KM on withdrawal sleeve AOHX 3092 G, fitting a 440 mm shaft (17.323 in), housing bore 680 mm, bearing width 163 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4000 kN, C0 7500 kN, fatigue load limit Pu 520 kN, combined mass about 230.0 kg. Reference speed 700 r/min, limiting speed 950 r/min (bearing values)." }, { "q": "Why does C3092-KM-AOHX3092-G list a 440 mm shaft size when the bearing bore is 460 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOHX 3092 G has a tapered outside that engages the bearing's 460 mm tapered bore and a cylindrical bore that seats on the 440 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3092-KM-AOHX3092-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3092 KM and the sleeve AOHX 3092 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3092-KM-AOHX3092-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3092-KM-AOHX3092-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOHX 3092 G is driven or pressed to a marked travel on the 440 mm seat, which sets the interference into the 460 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3092", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3092-KM-AOHX3092-G", "SKF C 3092 KM + AOHX 3092 G", "C 3092 KM + AOHX 3092 G", "C 3092 KM", "AOHX 3092 G" ], "locale_variants": {}, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "max_rpm": 950 }, { "sku": "C3096-KM-AOHX3096-G", "brand": "SKF", "manufacturer_designation": "SKF C 3096 KM + AOHX 3096 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 460, "D_mm": 700, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4050, "static_load_kN": 7800, "fatigue_load_limit_kN": 530, "weight_g": 245000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "On the SKF nameplate, C3096-KM-AOHX3096-G reads as two catalogued components: the CARB bearing C 3096 KM with its 480 mm tapered (K) bore, and the withdrawal sleeve AOHX 3096 G whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 460 mm shaft size. Sleeve discipline for AOHX 3096 G: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution. With a combined mass of 245.0 kg over the 460×700×165 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Mounting C3096-KM-AOHX3096-G at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 460 mm seat and verify the residual radial clearance of the 480 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3096 KM and AOHX 3096 G must be checked against the application temperature before substitution.SKF C 3096 KM + AOHX 3096 G denotes bearing C 3096 KM mounted on withdrawal sleeve AOHX 3096 G: a 460 mm shaft seat, 700 mm housing bore, and the sleeve providing the interference a 480 mm tapered bore needs.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Do not run C3096-KM-AOHX3096-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C3096-KM-AOHX3096-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Do not run C3096-KM-AOHX3096-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 4050/7800 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 3096 KM + AOHX 3096 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C3096-KM-AOHX3096-G?", "a": "The unit is CARB bearing C 3096 KM on withdrawal sleeve AOHX 3096 G, fitting a 460 mm shaft (18.11 in), housing bore 700 mm, bearing width 165 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4050 kN, C0 7800 kN, fatigue load limit Pu 530 kN, combined mass about 245.0 kg. Reference speed 670 r/min, limiting speed 900 r/min (bearing values)." }, { "q": "Why does C3096-KM-AOHX3096-G list a 460 mm shaft size when the bearing bore is 480 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOHX 3096 G has a tapered outside that engages the bearing's 480 mm tapered bore and a cylindrical bore that seats on the 460 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C3096-KM-AOHX3096-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 3096 KM and the sleeve AOHX 3096 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3096-KM-AOHX3096-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C3096-KM-AOHX3096-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOHX 3096 G is driven or pressed to a marked travel on the 460 mm seat, which sets the interference into the 480 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C3096", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C3096-KM-AOHX3096-G", "SKF C 3096 KM + AOHX 3096 G", "C 3096 KM + AOHX 3096 G", "C 3096 KM", "AOHX 3096 G" ], "locale_variants": {}, "reference_speed_rpm": 670, "limiting_speed_rpm": 900, "max_rpm": 900 }, { "sku": "C31-500-KM-AOHX31-500-G", "brand": "SKF", "manufacturer_designation": "SKF C 31/500 KM + AOHX 31/500 G", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 480, "D_mm": 830, "B_mm": 264, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 7500, "static_load_kN": 12700, "fatigue_load_limit_kN": 850, "weight_g": 615000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Selection arithmetic: the unit carries the ratings of its bearing — C 7500 kN, C0 12700 kN, Pu 850 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 480 mm shaft. Dismounting uses the withdrawal thread on AOHX 31/500 G: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 480 mm seat as one piece and the seat stays undamaged. Housing side of C31-500-KM-AOHX31-500-G is conventional: a 830 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 480 mm shaft.In SKF catalogue PUB BU/P1 17000, C31-500-KM-AOHX31-500-G appears as bearing C 31/500 KM + withdrawal sleeve AOHX 31/500 G — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 615 kg.Digit by digit, C31-500-KM-AOHX31-500-G = CARB bearing C 31/500 KM (500 mm bore, 830 mm OD, 264 mm width) + withdrawal sleeve AOHX 31/500 G for the 480 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Why a withdrawal sleeve at 480 mm shaft: adapter-sleeve locknut forces become impractical on the 500 mm bore; the AOHX 31/500 G execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat.", "applications": [ "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Never set C31-500-KM-AOHX31-500-G by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 500 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Sleeve and bearing are a matched taper pair: never fit sleeve AOHX 31/500 G onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not run C31-500-KM-AOHX31-500-G as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 7500/12700 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 31/500 KM + AOHX 31/500 G when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C31-500-KM-AOHX31-500-G?", "a": "The unit is CARB bearing C 31/500 KM on withdrawal sleeve AOHX 31/500 G, fitting a 480 mm shaft (18.898 in), housing bore 830 mm, bearing width 264 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7500 kN, C0 12700 kN, fatigue load limit Pu 850 kN, combined mass about 615.0 kg. Reference speed 530 r/min, limiting speed 750 r/min (bearing values)." }, { "q": "Why does C31-500-KM-AOHX31-500-G list a 480 mm shaft size when the bearing bore is 500 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOHX 31/500 G has a tapered outside that engages the bearing's 500 mm tapered bore and a cylindrical bore that seats on the 480 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C31-500-KM-AOHX31-500-G a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 31/500 KM and the sleeve AOHX 31/500 G separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C31-500-KM-AOHX31-500-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C31-500-KM-AOHX31-500-G set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOHX 31/500 G is driven or pressed to a marked travel on the 480 mm seat, which sets the interference into the 500 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C31", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-500-KM-AOHX31-500-G", "SKF C 31/500 KM + AOHX 31/500 G", "C 31/500 KM + AOHX 31/500 G", "C 31/500 KM", "AOHX 31/500 G" ], "locale_variants": {}, "reference_speed_rpm": 530, "limiting_speed_rpm": 750, "max_rpm": 750 }, { "sku": "C30-530-KM-AOH30-530", "brand": "SKF", "manufacturer_designation": "SKF C 30/530 KM + AOH 30/530", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 500, "D_mm": 780, "B_mm": 185, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5100, "static_load_kN": 9500, "fatigue_load_limit_kN": 630, "weight_g": 355000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Dismounting uses the withdrawal thread on AOH 30/530: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 500 mm seat as one piece and the seat stays undamaged. Housing side of C30-530-KM-AOH30-530 is conventional: a 780 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 500 mm shaft.For a 500 mm shaft SKF lists C30-530-KM-AOH30-530 as the complete unit: CARB bearing C 30/530 KM plus withdrawal sleeve AOH 30/530, one catalogue entry covering both components.Numbering logic: the bearing half C 30/530 KM follows the CARB works numbering (type C, dimension series, 530 mm bore), while AOH 30/530 identifies the sleeve execution for that bore; the combo C30-530-KM-AOH30-530 exists in the catalogue so that shaft (500 mm), housing (780 mm) and both components are specified with one order number. Sleeve discipline for AOH 30/530: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution. The C0/C balance of about 1.86 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "misalignment edge loading when the housing bore is out of square with the shaft seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve AOH 30/530 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Never set C30-530-KM-AOH30-530 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 530 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Sleeve and bearing are a matched taper pair: never fit sleeve AOH 30/530 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "The 5100/9500 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/530 KM + AOH 30/530 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-530-KM-AOH30-530?", "a": "The unit is CARB bearing C 30/530 KM on withdrawal sleeve AOH 30/530, fitting a 500 mm shaft (19.685 in), housing bore 780 mm, bearing width 185 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5100 kN, C0 9500 kN, fatigue load limit Pu 630 kN, combined mass about 355.0 kg. Reference speed 600 r/min, limiting speed 800 r/min (bearing values)." }, { "q": "Why does C30-530-KM-AOH30-530 list a 500 mm shaft size when the bearing bore is 530 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 30/530 has a tapered outside that engages the bearing's 530 mm tapered bore and a cylindrical bore that seats on the 500 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-530-KM-AOH30-530 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/530 KM and the sleeve AOH 30/530 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-530-KM-AOH30-530 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-530-KM-AOH30-530 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 30/530 is driven or pressed to a marked travel on the 500 mm seat, which sets the interference into the 530 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-530-KM-AOH30-530", "SKF C 30/530 KM + AOH 30/530", "C 30/530 KM + AOH 30/530", "C 30/530 KM", "AOH 30/530" ], "locale_variants": {}, "reference_speed_rpm": 600, "limiting_speed_rpm": 800, "max_rpm": 800 }, { "sku": "C30-560-KM-AOHX30-560", "brand": "SKF", "manufacturer_designation": "SKF C 30/560 KM + AOHX 30/560", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 530, "D_mm": 820, "B_mm": 195, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5600, "static_load_kN": 11000, "fatigue_load_limit_kN": 720, "weight_g": 415000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Spare-parts note: order C30-560-KM-AOHX30-560 as the unit; a bare C 30/560 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.C30-560-KM-AOHX30-560 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 30/560 KM on withdrawal sleeve AOHX 30/560, listed in SKF catalogue PUB BU/P1 17000 for a 530 mm shaft seat.On the SKF nameplate, C30-560-KM-AOHX30-560 reads as two catalogued components: the CARB bearing C 30/560 KM with its 560 mm tapered (K) bore, and the withdrawal sleeve AOHX 30/560 whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 530 mm shaft size. Sleeve discipline for AOHX 30/560: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution. With a combined mass of 415.0 kg over the 530×820×195 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Record the sleeve travel at mounting of C30-560-KM-AOHX30-560: the clearance set into the 560 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 530 mm shaft over the years.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "vibrating screen exciters fitted with the VE240 tolerance execution" ], "failure_modes": [ "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C30-560-KM-AOHX30-560 unit — replace the sleeve with the bearing.", "Keep the pair complete in stores: storing bearing C 30/560 KM and sleeve AOHX 30/560 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Keep the pair complete in stores: storing bearing C 30/560 KM and sleeve AOHX 30/560 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "The 5600/11000 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/560 KM + AOHX 30/560 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-560-KM-AOHX30-560?", "a": "The unit is CARB bearing C 30/560 KM on withdrawal sleeve AOHX 30/560, fitting a 530 mm shaft (20.866 in), housing bore 820 mm, bearing width 195 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5600 kN, C0 11000 kN, fatigue load limit Pu 720 kN, combined mass about 415.0 kg. Reference speed 530 r/min, limiting speed 750 r/min (bearing values)." }, { "q": "Why does C30-560-KM-AOHX30-560 list a 530 mm shaft size when the bearing bore is 560 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOHX 30/560 has a tapered outside that engages the bearing's 560 mm tapered bore and a cylindrical bore that seats on the 530 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-560-KM-AOHX30-560 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/560 KM and the sleeve AOHX 30/560 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-560-KM-AOHX30-560 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-560-KM-AOHX30-560 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOHX 30/560 is driven or pressed to a marked travel on the 530 mm seat, which sets the interference into the 560 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-560-KM-AOHX30-560", "SKF C 30/560 KM + AOHX 30/560", "C 30/560 KM + AOHX 30/560", "C 30/560 KM", "AOHX 30/560" ], "locale_variants": {}, "reference_speed_rpm": 530, "limiting_speed_rpm": 750, "max_rpm": 750 }, { "sku": "C30-600-KM-AOHX30-600", "brand": "SKF", "manufacturer_designation": "SKF C 30/600 KM + AOHX 30/600", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 570, "D_mm": 870, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6300, "static_load_kN": 12200, "fatigue_load_limit_kN": 780, "weight_g": 460000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Mounting C30-600-KM-AOHX30-600 at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 570 mm seat and verify the residual radial clearance of the 600 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 30/600 KM and AOHX 30/600 must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C30-600-KM-AOHX30-600 appears as bearing C 30/600 KM + withdrawal sleeve AOHX 30/600 — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 460 kg.On the SKF nameplate, C30-600-KM-AOHX30-600 reads as two catalogued components: the CARB bearing C 30/600 KM with its 600 mm tapered (K) bore, and the withdrawal sleeve AOHX 30/600 whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 570 mm shaft size. Withdrawal sleeve AOHX 30/600: at this size the sleeve is pulled onto the 570 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 600 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. Dividing C 6300 kN by the 600 mm bore gives 10.50 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 570 mm seat is fixed and the life requirement is not.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 30/600 KM and sleeve AOHX 30/600 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Keep the pair complete in stores: storing bearing C 30/600 KM and sleeve AOHX 30/600 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Protect the 570 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C30-600-KM-AOHX30-600.", "The 6300/12200 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/600 KM + AOHX 30/600 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-600-KM-AOHX30-600?", "a": "The unit is CARB bearing C 30/600 KM on withdrawal sleeve AOHX 30/600, fitting a 570 mm shaft (22.441 in), housing bore 870 mm, bearing width 200 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6300 kN, C0 12200 kN, fatigue load limit Pu 780 kN, combined mass about 460.0 kg. Reference speed 500 r/min, limiting speed 700 r/min (bearing values)." }, { "q": "Why does C30-600-KM-AOHX30-600 list a 570 mm shaft size when the bearing bore is 600 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOHX 30/600 has a tapered outside that engages the bearing's 600 mm tapered bore and a cylindrical bore that seats on the 570 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-600-KM-AOHX30-600 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/600 KM and the sleeve AOHX 30/600 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-600-KM-AOHX30-600 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-600-KM-AOHX30-600 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOHX 30/600 is driven or pressed to a marked travel on the 570 mm seat, which sets the interference into the 600 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-600-KM-AOHX30-600", "SKF C 30/600 KM + AOHX 30/600", "C 30/600 KM + AOHX 30/600", "C 30/600 KM", "AOHX 30/600" ], "locale_variants": {}, "reference_speed_rpm": 500, "limiting_speed_rpm": 700, "max_rpm": 700 }, { "sku": "C30-630-KM-AOH30-630", "brand": "SKF", "manufacturer_designation": "SKF C 30/630 KM + AOH 30/630", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 600, "D_mm": 920, "B_mm": 212, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 6800, "static_load_kN": 12900, "fatigue_load_limit_kN": 815, "weight_g": 555000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Record the sleeve travel at mounting of C30-630-KM-AOH30-630: the clearance set into the 630 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 600 mm shaft over the years. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 30/630 KM and AOH 30/630 must be checked against the application temperature before substitution.SKF C 30/630 KM + AOH 30/630 denotes bearing C 30/630 KM mounted on withdrawal sleeve AOH 30/630: a 600 mm shaft seat, 920 mm housing bore, and the sleeve providing the interference a 630 mm tapered bore needs.On the SKF nameplate, C30-630-KM-AOH30-630 reads as two catalogued components: the CARB bearing C 30/630 KM with its 630 mm tapered (K) bore, and the withdrawal sleeve AOH 30/630 whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 600 mm shaft size. Why a withdrawal sleeve at 600 mm shaft: adapter-sleeve locknut forces become impractical on the 630 mm bore; the AOH 30/630 execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. Speed note: for C30-630-KM-AOH30-630 the CARB table lists 480 r/min reference and 670 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 600 mm seat.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Never set C30-630-KM-AOH30-630 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 630 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C30-630-KM-AOH30-630 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "Do not run C30-630-KM-AOH30-630 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 6800/12900 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/630 KM + AOH 30/630 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-630-KM-AOH30-630?", "a": "The unit is CARB bearing C 30/630 KM on withdrawal sleeve AOH 30/630, fitting a 600 mm shaft (23.622 in), housing bore 920 mm, bearing width 212 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6800 kN, C0 12900 kN, fatigue load limit Pu 815 kN, combined mass about 555.0 kg. Reference speed 480 r/min, limiting speed 670 r/min (bearing values)." }, { "q": "Why does C30-630-KM-AOH30-630 list a 600 mm shaft size when the bearing bore is 630 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 30/630 has a tapered outside that engages the bearing's 630 mm tapered bore and a cylindrical bore that seats on the 600 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-630-KM-AOH30-630 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/630 KM and the sleeve AOH 30/630 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-630-KM-AOH30-630 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-630-KM-AOH30-630 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 30/630 is driven or pressed to a marked travel on the 600 mm seat, which sets the interference into the 630 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-630-KM-AOH30-630", "SKF C 30/630 KM + AOH 30/630", "C 30/630 KM + AOH 30/630", "C 30/630 KM", "AOH 30/630" ], "locale_variants": {}, "reference_speed_rpm": 480, "limiting_speed_rpm": 670, "max_rpm": 670 }, { "sku": "C30-670-KM-AOH30-670", "brand": "SKF", "manufacturer_designation": "SKF C 30/670 KM + AOH 30/670", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 630, "D_mm": 980, "B_mm": 230, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8150, "static_load_kN": 16300, "fatigue_load_limit_kN": 1000, "weight_g": 705000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF C 30/670 KM + AOH 30/670 denotes bearing C 30/670 KM mounted on withdrawal sleeve AOH 30/670: a 630 mm shaft seat, 980 mm housing bore, and the sleeve providing the interference a 670 mm tapered bore needs.Digit by digit, C30-670-KM-AOH30-670 = CARB bearing C 30/670 KM (670 mm bore, 980 mm OD, 230 mm width) + withdrawal sleeve AOH 30/670 for the 630 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Combined mass of the unit — bearing C 30/670 KM plus sleeve AOH 30/670 — is about 705 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. With a combined mass of 705.0 kg over the 630×980×230 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Mounting C30-670-KM-AOH30-670 at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 630 mm seat and verify the residual radial clearance of the 670 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. Housing side of C30-670-KM-AOH30-670 is conventional: a 980 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 630 mm shaft.", "applications": [ "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "paper machine drying cylinders and calender rolls with long, thermally expanding shafts", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication" ], "pitfalls": [ "Protect the 630 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C30-670-KM-AOH30-670.", "Sleeve and bearing are a matched taper pair: never fit sleeve AOH 30/670 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C30-670-KM-AOH30-670 unit — replace the sleeve with the bearing.", "The 8150/16300 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/670 KM + AOH 30/670 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-670-KM-AOH30-670?", "a": "The unit is CARB bearing C 30/670 KM on withdrawal sleeve AOH 30/670, fitting a 630 mm shaft (24.803 in), housing bore 980 mm, bearing width 230 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8150 kN, C0 16300 kN, fatigue load limit Pu 1000 kN, combined mass about 705.0 kg. Reference speed 430 r/min, limiting speed 600 r/min (bearing values)." }, { "q": "Why does C30-670-KM-AOH30-670 list a 630 mm shaft size when the bearing bore is 670 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 30/670 has a tapered outside that engages the bearing's 670 mm tapered bore and a cylindrical bore that seats on the 630 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-670-KM-AOH30-670 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/670 KM and the sleeve AOH 30/670 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-670-KM-AOH30-670 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-670-KM-AOH30-670 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 30/670 is driven or pressed to a marked travel on the 630 mm seat, which sets the interference into the 670 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-670-KM-AOH30-670", "SKF C 30/670 KM + AOH 30/670", "C 30/670 KM + AOH 30/670", "C 30/670 KM", "AOH 30/670" ], "locale_variants": {}, "reference_speed_rpm": 430, "limiting_speed_rpm": 600, "max_rpm": 600 }, { "sku": "C30-710-KM-AOHX30-710", "brand": "SKF", "manufacturer_designation": "SKF C 30/710 KM + AOHX 30/710", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 670, "D_mm": 1030, "B_mm": 236, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 8800, "static_load_kN": 17300, "fatigue_load_limit_kN": 1060, "weight_g": 780000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The code breaks into bearing C 30/710 KM and withdrawal sleeve AOHX 30/710: C marks the CARB type, the digit group the 710 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C30-710-KM-AOHX30-710. Withdrawal sleeve AOHX 30/710: at this size the sleeve is pulled onto the 670 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 710 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. Dividing C 8800 kN by the 710 mm bore gives 12.39 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 670 mm seat is fixed and the life requirement is not. Record the sleeve travel at mounting of C30-710-KM-AOHX30-710: the clearance set into the 710 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 670 mm shaft over the years. Spare-parts note: order C30-710-KM-AOHX30-710 as the unit; a bare C 30/710 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.For a 670 mm shaft SKF lists C30-710-KM-AOHX30-710 as the complete unit: CARB bearing C 30/710 KM plus withdrawal sleeve AOHX 30/710, one catalogue entry covering both components.", "applications": [ "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "heavy industrial gearbox layshafts used as the non-locating position" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 30/710 KM and sleeve AOHX 30/710 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Sleeve and bearing are a matched taper pair: never fit sleeve AOHX 30/710 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C30-710-KM-AOHX30-710 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 8800/17300 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/710 KM + AOHX 30/710 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-710-KM-AOHX30-710?", "a": "The unit is CARB bearing C 30/710 KM on withdrawal sleeve AOHX 30/710, fitting a 670 mm shaft (26.378 in), housing bore 1030 mm, bearing width 236 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8800 kN, C0 17300 kN, fatigue load limit Pu 1060 kN, combined mass about 780.0 kg. Reference speed 400 r/min, limiting speed 560 r/min (bearing values)." }, { "q": "Why does C30-710-KM-AOHX30-710 list a 670 mm shaft size when the bearing bore is 710 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOHX 30/710 has a tapered outside that engages the bearing's 710 mm tapered bore and a cylindrical bore that seats on the 670 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-710-KM-AOHX30-710 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/710 KM and the sleeve AOHX 30/710 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-710-KM-AOHX30-710 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-710-KM-AOHX30-710 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOHX 30/710 is driven or pressed to a marked travel on the 670 mm seat, which sets the interference into the 710 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-710-KM-AOHX30-710", "SKF C 30/710 KM + AOHX 30/710", "C 30/710 KM + AOHX 30/710", "C 30/710 KM", "AOHX 30/710" ], "locale_variants": {}, "reference_speed_rpm": 400, "limiting_speed_rpm": 560, "max_rpm": 560 }, { "sku": "C30-750-KMB-AOH30-750", "brand": "SKF", "manufacturer_designation": "SKF C 30/750 KMB + AOH 30/750", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 710, "D_mm": 1090, "B_mm": 250, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9500, "static_load_kN": 19300, "fatigue_load_limit_kN": 1160, "weight_g": 920000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 710 mm shaft SKF lists C30-750-KMB-AOH30-750 as the complete unit: CARB bearing C 30/750 KMB plus withdrawal sleeve AOH 30/750, one catalogue entry covering both components.Reading the designation: C 30/750 KMB is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the withdrawal sleeve AOH 30/750 carries the tapered bore seat on a 710 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore. The AOH 30/750 execution defines the fit on the 710 mm cylindrical seat by sleeve travel rather than locknut torque; the mounting procedure records that travel, because the running clearance of the CARB bearing is set by the same taper. Speed note: for C30-750-KMB-AOH30-750 the CARB table lists 380 r/min reference and 530 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 710 mm seat. Mounting C30-750-KMB-AOH30-750 at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 710 mm seat and verify the residual radial clearance of the 750 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 30/750 KMB and AOH 30/750 must be checked against the application temperature before substitution.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "misalignment edge loading when the housing bore is out of square with the shaft seat", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "misalignment edge loading when the housing bore is out of square with the shaft seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 30/750 KMB and sleeve AOH 30/750 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Keep the pair complete in stores: storing bearing C 30/750 KMB and sleeve AOH 30/750 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not run C30-750-KMB-AOH30-750 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "The 9500/19300 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/750 KMB + AOH 30/750 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-750-KMB-AOH30-750?", "a": "The unit is CARB bearing C 30/750 KMB on withdrawal sleeve AOH 30/750, fitting a 710 mm shaft (27.953 in), housing bore 1090 mm, bearing width 250 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 9500 kN, C0 19300 kN, fatigue load limit Pu 1160 kN, combined mass about 920.0 kg. Reference speed 380 r/min, limiting speed 530 r/min (bearing values)." }, { "q": "Why does C30-750-KMB-AOH30-750 list a 710 mm shaft size when the bearing bore is 750 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 30/750 has a tapered outside that engages the bearing's 750 mm tapered bore and a cylindrical bore that seats on the 710 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-750-KMB-AOH30-750 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/750 KMB and the sleeve AOH 30/750 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-750-KMB-AOH30-750 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-750-KMB-AOH30-750 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 30/750 is driven or pressed to a marked travel on the 710 mm seat, which sets the interference into the 750 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-750-KMB-AOH30-750", "SKF C 30/750 KMB + AOH 30/750", "C 30/750 KMB + AOH 30/750", "C 30/750 KMB", "AOH 30/750" ], "locale_variants": {}, "reference_speed_rpm": 380, "limiting_speed_rpm": 530, "max_rpm": 530 }, { "sku": "C30-800-KMB-AOH30-800", "brand": "SKF", "manufacturer_designation": "SKF C 30/800 KMB + AOH 30/800", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 750, "D_mm": 1150, "B_mm": 258, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 9300, "static_load_kN": 19300, "fatigue_load_limit_kN": 1140, "weight_g": 1060000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Mounting C30-800-KMB-AOH30-800 at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 750 mm seat and verify the residual radial clearance of the 800 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. Housing side of C30-800-KMB-AOH30-800 is conventional: a 1150 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 750 mm shaft.In SKF catalogue PUB BU/P1 17000, C30-800-KMB-AOH30-800 appears as bearing C 30/800 KMB + withdrawal sleeve AOH 30/800 — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 1060 kg.On the SKF nameplate, C30-800-KMB-AOH30-800 reads as two catalogued components: the CARB bearing C 30/800 KMB with its 800 mm tapered (K) bore, and the withdrawal sleeve AOH 30/800 whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 750 mm shaft size. The AOH 30/800 execution defines the fit on the 750 mm cylindrical seat by sleeve travel rather than locknut torque; the mounting procedure records that travel, because the running clearance of the CARB bearing is set by the same taper. Speed note: for C30-800-KMB-AOH30-800 the CARB table lists 360 r/min reference and 480 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 750 mm seat.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C30-800-KMB-AOH30-800 unit — replace the sleeve with the bearing.", "Protect the 750 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C30-800-KMB-AOH30-800.", "Keep the pair complete in stores: storing bearing C 30/800 KMB and sleeve AOH 30/800 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "The 9300/19300 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/800 KMB + AOH 30/800 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-800-KMB-AOH30-800?", "a": "The unit is CARB bearing C 30/800 KMB on withdrawal sleeve AOH 30/800, fitting a 750 mm shaft (29.528 in), housing bore 1150 mm, bearing width 258 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 9300 kN, C0 19300 kN, fatigue load limit Pu 1140 kN, combined mass about 1060.0 kg. Reference speed 360 r/min, limiting speed 480 r/min (bearing values)." }, { "q": "Why does C30-800-KMB-AOH30-800 list a 750 mm shaft size when the bearing bore is 800 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 30/800 has a tapered outside that engages the bearing's 800 mm tapered bore and a cylindrical bore that seats on the 750 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-800-KMB-AOH30-800 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/800 KMB and the sleeve AOH 30/800 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-800-KMB-AOH30-800 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-800-KMB-AOH30-800 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 30/800 is driven or pressed to a marked travel on the 750 mm seat, which sets the interference into the 800 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-800-KMB-AOH30-800", "SKF C 30/800 KMB + AOH 30/800", "C 30/800 KMB + AOH 30/800", "C 30/800 KMB", "AOH 30/800" ], "locale_variants": {}, "reference_speed_rpm": 360, "limiting_speed_rpm": 480, "max_rpm": 480 }, { "sku": "C30-850-KMB-AOH30-850", "brand": "SKF", "manufacturer_designation": "SKF C 30/850 KMB + AOH 30/850", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 800, "D_mm": 1220, "B_mm": 272, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 11600, "static_load_kN": 24500, "fatigue_load_limit_kN": 1430, "weight_g": 1280000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 30/850 KMB and AOH 30/850 must be checked against the application temperature before substitution.The C30-850-KMB-AOH30-850 unit combines the 850 mm-bore CARB toroidal roller bearing C 30/850 KMB with withdrawal sleeve AOH 30/850, giving controlled mounting interference on a plain 800 mm cylindrical seat.On the SKF nameplate, C30-850-KMB-AOH30-850 reads as two catalogued components: the CARB bearing C 30/850 KMB with its 850 mm tapered (K) bore, and the withdrawal sleeve AOH 30/850 whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 800 mm shaft size. The AOH 30/850 execution defines the fit on the 800 mm cylindrical seat by sleeve travel rather than locknut torque; the mounting procedure records that travel, because the running clearance of the CARB bearing is set by the same taper. The C0/C balance of about 2.11 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Dismounting uses the withdrawal thread on AOH 30/850: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 800 mm seat as one piece and the seat stays undamaged.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance" ], "pitfalls": [ "Keep the pair complete in stores: storing bearing C 30/850 KMB and sleeve AOH 30/850 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.", "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C30-850-KMB-AOH30-850 unit — replace the sleeve with the bearing.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C30-850-KMB-AOH30-850 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 11600/24500 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/850 KMB + AOH 30/850 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-850-KMB-AOH30-850?", "a": "The unit is CARB bearing C 30/850 KMB on withdrawal sleeve AOH 30/850, fitting a 800 mm shaft (31.496 in), housing bore 1220 mm, bearing width 272 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 11600 kN, C0 24500 kN, fatigue load limit Pu 1430 kN, combined mass about 1280.0 kg. Reference speed 320 r/min, limiting speed 450 r/min (bearing values)." }, { "q": "Why does C30-850-KMB-AOH30-850 list a 800 mm shaft size when the bearing bore is 850 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 30/850 has a tapered outside that engages the bearing's 850 mm tapered bore and a cylindrical bore that seats on the 800 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-850-KMB-AOH30-850 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/850 KMB and the sleeve AOH 30/850 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-850-KMB-AOH30-850 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-850-KMB-AOH30-850 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 30/850 is driven or pressed to a marked travel on the 800 mm seat, which sets the interference into the 850 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-850-KMB-AOH30-850", "SKF C 30/850 KMB + AOH 30/850", "C 30/850 KMB + AOH 30/850", "C 30/850 KMB", "AOH 30/850" ], "locale_variants": {}, "reference_speed_rpm": 320, "limiting_speed_rpm": 450, "max_rpm": 450 }, { "sku": "C30-900-KMB-AOH30-900", "brand": "SKF", "manufacturer_designation": "SKF C 30/900 KMB + AOH 30/900", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 850, "D_mm": 1280, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 12700, "static_load_kN": 26500, "fatigue_load_limit_kN": 1530, "weight_g": 1400000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Why a withdrawal sleeve at 850 mm shaft: adapter-sleeve locknut forces become impractical on the 900 mm bore; the AOH 30/900 execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. The C0/C balance of about 2.09 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Dismounting uses the withdrawal thread on AOH 30/900: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 850 mm seat as one piece and the seat stays undamaged. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 30/900 KMB and AOH 30/900 must be checked against the application temperature before substitution.The C30-900-KMB-AOH30-900 unit combines the 900 mm-bore CARB toroidal roller bearing C 30/900 KMB with withdrawal sleeve AOH 30/900, giving controlled mounting interference on a plain 850 mm cylindrical seat.Digit by digit, C30-900-KMB-AOH30-900 = CARB bearing C 30/900 KMB (900 mm bore, 1280 mm OD, 280 mm width) + withdrawal sleeve AOH 30/900 for the 850 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation.", "applications": [ "continuous-caster guide rolls and slab-caster segments under heat growth", "vibrating screen exciters fitted with the VE240 tolerance execution", "long fan and kiln main shafts where the free end must float without thrust load", "winder and reel drums in paper and steel strip plants" ], "failure_modes": [ "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Sleeve and bearing are a matched taper pair: never fit sleeve AOH 30/900 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Sleeve and bearing are a matched taper pair: never fit sleeve AOH 30/900 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.", "Never set C30-900-KMB-AOH30-900 by locknut torque or \"feel\": the withdrawal sleeve travel defines the clearance of the 900 mm CARB bearing — measure residual radial clearance during mounting, in steps.", "The 12700/26500 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 30/900 KMB + AOH 30/900 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C30-900-KMB-AOH30-900?", "a": "The unit is CARB bearing C 30/900 KMB on withdrawal sleeve AOH 30/900, fitting a 850 mm shaft (33.465 in), housing bore 1280 mm, bearing width 280 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 12700 kN, C0 26500 kN, fatigue load limit Pu 1530 kN, combined mass about 1400.0 kg. Reference speed 300 r/min, limiting speed 400 r/min (bearing values)." }, { "q": "Why does C30-900-KMB-AOH30-900 list a 850 mm shaft size when the bearing bore is 900 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 30/900 has a tapered outside that engages the bearing's 900 mm tapered bore and a cylindrical bore that seats on the 850 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C30-900-KMB-AOH30-900 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 30/900 KMB and the sleeve AOH 30/900 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-900-KMB-AOH30-900 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C30-900-KMB-AOH30-900 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 30/900 is driven or pressed to a marked travel on the 850 mm seat, which sets the interference into the 900 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C30-900-KMB-AOH30-900", "SKF C 30/900 KMB + AOH 30/900", "C 30/900 KMB + AOH 30/900", "C 30/900 KMB", "AOH 30/900" ], "locale_variants": {}, "reference_speed_rpm": 300, "limiting_speed_rpm": 400, "max_rpm": 400 }, { "sku": "C31-1000-KMB-AOH31-1000", "brand": "SKF", "manufacturer_designation": "SKF C 31/1000 KMB + AOH 31/1000", "series": "carb-withdrawal-sleeve", "type": "carb_toroidal", "d_mm": 950, "D_mm": 1580, "B_mm": 462, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 20400, "static_load_kN": 45500, "fatigue_load_limit_kN": 2500, "weight_g": 3950000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": " Speed note: for C31-1000-KMB-AOH31-1000 the CARB table lists 220 r/min reference and 300 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 950 mm seat. Record the sleeve travel at mounting of C31-1000-KMB-AOH31-1000: the clearance set into the 1000 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 950 mm shaft over the years. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 31/1000 KMB and AOH 31/1000 must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C31-1000-KMB-AOH31-1000 appears as bearing C 31/1000 KMB + withdrawal sleeve AOH 31/1000 — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 3950 kg.Digit by digit, C31-1000-KMB-AOH31-1000 = CARB bearing C 31/1000 KMB (1000 mm bore, 1580 mm OD, 462 mm width) + withdrawal sleeve AOH 31/1000 for the 950 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Why a withdrawal sleeve at 950 mm shaft: adapter-sleeve locknut forces become impractical on the 1000 mm bore; the AOH 31/1000 execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat.", "applications": [ "long fan and kiln main shafts where the free end must float without thrust load", "heavy industrial gearbox layshafts used as the non-locating position", "winder and reel drums in paper and steel strip plants", "long fan and kiln main shafts where the free end must float without thrust load" ], "failure_modes": [ "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance", "raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication", "fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat" ], "pitfalls": [ "Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C31-1000-KMB-AOH31-1000 unit — replace the sleeve with the bearing.", "Do not run C31-1000-KMB-AOH31-1000 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.", "Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C31-1000-KMB-AOH31-1000 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.", "The 20400/45500 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.", "Quote the full unit designation SKF C 31/1000 KMB + AOH 31/1000 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair." ], "faq": [ { "q": "What are the dimensions and catalogue data of C31-1000-KMB-AOH31-1000?", "a": "The unit is CARB bearing C 31/1000 KMB on withdrawal sleeve AOH 31/1000, fitting a 950 mm shaft (37.402 in), housing bore 1580 mm, bearing width 462 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 20400 kN, C0 45500 kN, fatigue load limit Pu 2500 kN, combined mass about 3950.0 kg. Reference speed 220 r/min, limiting speed 300 r/min (bearing values)." }, { "q": "Why does C31-1000-KMB-AOH31-1000 list a 950 mm shaft size when the bearing bore is 1000 mm?", "a": "The sleeve takes up the difference: the withdrawal sleeve AOH 31/1000 has a tapered outside that engages the bearing's 1000 mm tapered bore and a cylindrical bore that seats on the 950 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone." }, { "q": "Is C31-1000-KMB-AOH31-1000 a locating or non-locating bearing?", "a": "Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function." }, { "q": "Can I buy the bearing C 31/1000 KMB and the sleeve AOH 31/1000 separately?", "a": "The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C31-1000-KMB-AOH31-1000 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters." }, { "q": "How is the clearance of C31-1000-KMB-AOH31-1000 set at mounting?", "a": "By sleeve travel: the withdrawal sleeve AOH 31/1000 is driven or pressed to a marked travel on the 950 mm seat, which sets the interference into the 1000 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size." } ], "cross_ref": [ { "equiv_sku": "C31", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves", "extracted_at": "2026-09-29", "last_verified": "2026-09-29", "confidence_score": 0.7, "status": "published", "aliases": [ "C31-1000-KMB-AOH31-1000", "SKF C 31/1000 KMB + AOH 31/1000", "C 31/1000 KMB + AOH 31/1000", "C 31/1000 KMB", "AOH 31/1000" ], "locale_variants": {}, "reference_speed_rpm": 220, "limiting_speed_rpm": 300, "max_rpm": 300 } ]